add externals/nitro to fix merge conflicts

externals/nitro/externals/coda-oss/.clang-format

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+BasedOnStyle: Google
+AccessModifierOffset: '-4'
+AlignAfterOpenBracket: Align
+AlignConsecutiveAssignments: 'false'
+AlignConsecutiveDeclarations: 'false'
+AlignOperands: 'false'
+AlignTrailingComments: 'false'
+AllowShortBlocksOnASingleLine: 'false'
+AllowShortCaseLabelsOnASingleLine: 'false'
+AllowShortIfStatementsOnASingleLine: 'false'
+AllowShortLoopsOnASingleLine: 'false'
+AllowShortFunctionsOnASingleLine: 'false'
+AlwaysBreakAfterDefinitionReturnType: None
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: 'false'
+BinPackArguments: 'false'
+BinPackParameters: 'false'
+BreakConstructorInitializers: AfterColon
+BreakBeforeBraces: Allman
+PenaltyBreakBeforeFirstCallParameter: '100'
+ColumnLimit: '80'
+ContinuationIndentWidth: '8'
+DerivePointerAlignment: 'false'
+FixNamespaceComments: 'false'
+IndentCaseLabels: 'false'
+IndentWidth: '4'
+Language: Cpp
+PointerAlignment: Left
+SpacesInAngles: 'false'
+Standard: Cpp11
+UseTab: Never

externals/nitro/externals/coda-oss/.gitattributes

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+# prevent git from changing line endings for conan recipes and CMake files,
+# since they are hashed to produce a conan recipe revision ID
+conanfile.py text eol=lf
+CMakeLists.txt text eol=lf
+*.cmake text eol=lf
+*.in text eol=lf

externals/nitro/externals/coda-oss/.github/workflows/build_unittest.yml

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+name: build_unittest
+
+on: [push]
+
+jobs:
+  build-cmake-windows:
+    strategy:
+      matrix:
+        os: [windows-latest]
+        python-version: ['3.7']
+    name: ${{ matrix.os }}-${{ matrix.python-version }}-CMake
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install python dependencies
+      run: |
+        pip install numpy
+    - name: configure
+      run: |
+        ls env:
+        mkdir target-Release
+        cd target-Release
+        cmake .. -DCMAKE_INSTALL_PREFIX=install${{ matrix.os }}CMake-Github -DPYTHON_VERSION=${{ matrix.python-version }} -DENABLE_SWIG=ON
+        cd ..
+        mkdir target-Debug
+        cd target-Debug
+        cmake .. -DCMAKE_INSTALL_PREFIX=install${{ matrix.os }}CMake-Github -DENABLE_PYTHON=OFF
+    - name: build
+      run: |
+        cd target-Release
+        cmake --build . --config Release -j
+        cd ..
+        cd target-Debug
+        cmake --build . --config Debug -j
+    - name: install
+      run: |
+        cd target-Release
+        cmake --build . --config Release --target install
+        cd ..
+        cd target-Debug
+        cmake --build . --config Debug --target install
+    - name: test
+      run: |
+        cd target-Release
+        ctest -C Release
+        cd ..
+        cd target-Debug
+        ctest -C Debug
+
+  build-linux-cmake:
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        python-version: ['3.7']
+    name: ${{ matrix.os }}-${{ matrix.python-version }}-CMake
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install python dependencies
+      run: |
+        pip install numpy
+    - name: configure
+      run: |
+        env
+        which python
+        mkdir target
+        cd target
+        cmake .. -DCMAKE_INSTALL_PREFIX=install${{ matrix.os }}CMake-Github -DPYTHON_VERSION=${{ matrix.python-version }} -DENABLE_SWIG=ON
+    - name: build
+      run: |
+        cd target
+        # "-j" spawns too many processes causing GCC to crash
+        cmake --build . -j 12
+    - name: install
+      run: |
+        cd target
+        cmake --build . --target install
+    - name: test
+      run: |
+        cd target
+        ctest   
+
+  build-waf:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-2019]
+        python-version: ['3.7']
+        debugging: ['--enable-debugging', '']
+    name: ${{ matrix.os }}-${{ matrix.python-version }}-waf
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: configure_with_swig
+      if: ${{ matrix.os == 'ubuntu-latest' }}
+      run: |
+        pip install numpy
+        mkdir install${{ matrix.os }}Waf-Github
+        python waf configure --prefix="$PWD/install${{ matrix.os }}Waf-Github" --enable-swig ${{ matrix.debugging }}
+    - name: configure_without_swig
+      if: ${{ matrix.os == 'windows-2019' }}
+      run: |
+        pip install numpy
+        mkdir install${{ matrix.os }}Waf-Github
+        python waf configure --prefix="$PWD/install${{ matrix.os }}Waf-Github" ${{ matrix.debugging }}
+    - name: build
+      run: |
+        python waf build
+    - name: install
+      run: |
+        python waf install
+    - name: test
+      run: |
+        python waf install --alltests
+

externals/nitro/externals/coda-oss/.gitignore

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+*.swp
+*~
+*.pyc
+__pycache__/
+# Build artifacts
+
+install/
+install-*/
+target/
+
+# Conan
+modules/drivers/**/build
+test_package/build/
+
+# CMake
+_deps/
+CMakeCache.txt
+CMakeFiles/
+*_config.h
+Makefile
+modules/**/Makefile
+out/
+
+# Waf
+.waf-*
+waf-*
+.waf3-*
+waf3-*
+.lock-waf*
+build/waf*/
+
+# Eclipse
+.project
+.cproject
+
+# Drivers
+modules/drivers/fftw/fftw-2.1.*/
+modules/drivers/jpeg/jpeg-9/
+modules/drivers/jpeg/jpeg-9d/
+modules/drivers/j2k/openjpeg/openjpeg-2.3.*_mod/
+modules/drivers/pcre/pcre2-10.*/
+modules/drivers/uuid/e2fsprogs-1.*-uuid/
+modules/drivers/xml/xerces/xerces-c-*/
+modules/drivers/zlib/zlib-1.2.*/
+
+# VS
+.vs/
+project.sln
+.depproj/
+*.tlog
+**/x64/
+*.vcxproj.user
+
+CMakeSettings.json

externals/nitro/externals/coda-oss/CMakeLists.txt

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+# - CODA-OSS CMake Build script.
+#
+# Author:  Scott A. Colcord
+
+cmake_minimum_required(VERSION 3.14)
+
+set(TARGET_LANGUAGE c++)
+set(CMAKE_CXX_STANDARD 14)
+set(CXX_STANDARD_REQUIRED true)
+
+project(coda-oss)
+
+if (EXISTS "${CMAKE_BINARY_DIR}/conanbuildinfo.cmake")
+    # build and package with conan
+    include("${CMAKE_BINARY_DIR}/conanbuildinfo.cmake")
+    conan_basic_setup()
+
+    include("${CMAKE_BINARY_DIR}/conan_paths.cmake")
+endif()
+
+if (${CMAKE_PROJECT_NAME} STREQUAL coda-oss)
+    # this is the top level project
+
+    # set up warnings
+    if (MSVC)
+        # set warning level to /W3
+        string(REGEX REPLACE "/W[0-4]" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+        string(REGEX REPLACE "/W[0-4]" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
+	add_compile_options(/std:c++14)
+    elseif (UNIX)
+        add_compile_options(
+            -Wno-deprecated
+            -Wno-unused-value
+            -Wno-unused-but-set-variable
+        )
+	add_compile_options(-std=c++14)
+    endif()
+
+    list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
+    include(CodaBuild)
+
+    coda_initialize_build()
+
+    # install our cmake build modules for downstream use
+    install(DIRECTORY "cmake/"
+            DESTINATION "${CODA_STD_PROJECT_LIB_DIR}/cmake/"
+            FILES_MATCHING PATTERN "*.cmake")
+endif()
+
+add_subdirectory("modules")
+
+# generate package config, with the following paths exported
+set(JARS_DIR ${CODA_STD_PROJECT_LIB_DIR} CACHE INTERNAL
+    "path to installed jars, needed by downstream projects")
+set(SWIG_INCLUDE_DIR "${CODA_STD_PROJECT_INCLUDE_DIR}/swig" CACHE INTERNAL
+    "path to installed SWIG includes, needed by downstream projects")
+coda_generate_package_config(JARS_DIR SWIG_INCLUDE_DIR)