Merge changes from PRs #400, 414, 479, 480, 481, 483, 492, 493, 494, 495, 496 to support branches.

[lrknox]

#400 More warning fixes 580008d 22 files changed
#414 Changes found during merge to 1.12 fab95ce 85 files changed
#479 Align with "parallel fence" changes 3dbbd8a 13 files changed
#480 File locks now work on Windows 60e14b8 6 files changed
#481 small edits 98acb0a 2 files changed
#483 Adds an implementation 05bc190 3 files changed
for nanosleep on Windows
#492 Updates HSYS_GOTO_ERROR to 69f3cde 2 files changed
emit GetLastError() values on Win32
#493 Updates that allow accum SWMR e0eb5c6 2 files changed
tests to work on Windows
#494 Disable long double tests and 99c0f50 5 files changed
remove CMake flag groups
#495 Misc warning fixes df9abfe 9 files changed
#496 Removes support for 1f3f7fe 3 files changed
pre-2015 Visual Studio

[seanm]

@lrknox were these ever done?

[byrnHDF]

Will rely on branch compare as this is 1.5 years old.