QGIS3 major update

* apply qgis2to3
* update metadata.txt to qgis3
* update resources file to qt5
* fix another qgis2to3 issue
* Rewriting code for QGIS 3 part 1
Undertaken steps:
- importing some modules and classes in due to splitting the original ones (QtGui > QtGui, QtWidget)
- renaming some QGIS API 3.x classes
Result:
- plugin can be started in QGIS 3
- VFK file can be imported
* Decoding UTF-8
ad vfkTableModel.py:
- in Python 3 no longer needed "prefixes" u'...'/u"..."
ad mainApp.py:
- problem with decoding the file
I found this hack (can't find the source again), but the traceback says the byte can't be decoded - is the encoding truly utf-8?
sources:
https://timothybramlett.com/Strings_Bytes_and_Unicode_in_Python_2_and_3.html
https://medium.com/@andreacolangelo/strings-unicode-and-bytes-in-python-3-everything-you-always-wanted-to-know-27dc02ff2686
* quick and dirty QByteArray fix, see #3
* Completing API functions
Functions which run correctly
- import
- search form (owners excluded)
- export (HTML, LaTeX)
* add sample data

Co-authored-by: luciestara <[email protected]>

Makefile

@@ -74,7 +74,7 @@ default: compile
 compile: $(COMPILED_RESOURCE_FILES)
 
 %_rc.py : %.qrc $(RESOURCES_SRC)
-	pyrcc4 -o $*_rc.py  $<
+	pyrcc5 -o $*_rc.py  $<
 
 %.qm : %.ts
 	$(LRELEASE) $<

__init__.py

@@ -21,8 +21,9 @@
  ***************************************************************************/
  This script initializes the plugin, making it known to QGIS.
 """
+from __future__ import absolute_import
 
 
 def classFactory(iface):
-    from vfkPlugin import vfkPlugin
+    from .vfkPlugin import vfkPlugin
     return vfkPlugin(iface)

applyChanges.py

@@ -21,6 +21,9 @@
  *                                                                         *
  ***************************************************************************/
 """
+from __future__ import print_function
+from builtins import str
+from builtins import zip
 
 import sqlite3
 import sys
@@ -29,8 +32,8 @@
 import argparse
 from datetime import datetime
 
-from PyQt4.QtGui import QWidget, QApplication
-from PyQt4.QtCore import qDebug, pyqtSignal, SIGNAL
+from qgis.PyQt.QtWidgets import QWidget, QApplication
+from qgis.PyQt.QtCore import qDebug, pyqtSignal
 
 
 class ApplyChanges(QWidget):
@@ -58,7 +61,7 @@ def run(self, db_full, db_amendment, db_updated, use_debug=False):
         :type db_amendment: str
         :type db_updated: str
         """
-        self.emit(SIGNAL('preprocessingDatabase'))
+        self.preprocessingDatabase.emit()
 
         db_full = os.path.abspath(db_full)
         db_amendment = os.path.abspath(db_amendment)
@@ -82,18 +85,18 @@ def run(self, db_full, db_amendment, db_updated, use_debug=False):
 
             self.__applyChanges()
 
-        self.emit(SIGNAL('finishedStatus'))
+        self.finishedStatus.emit()
 
     def __applyChanges(self):
         """
         Method updates rows in main database by rows from databse with amendment data.
         """
         table_names = self.__findTablesWithChanges()
-        self.emit(SIGNAL("maxRangeProgressBar"), len(table_names))
+        self.maxRangeProgressBar.emit(len(table_names))
 
         # process all relevant tables
         for i, table in enumerate(table_names):
-            self.emit(SIGNAL("updateStatus"), i+1, table)
+            self.updateStatus.emit(i+1, table)
 
             # Delete data which are in both databases --> there are updates in amendment database
             query = 'DELETE FROM main.{table} ' \
@@ -138,7 +141,7 @@ def __doInsertOperation(self, table):
                     for item in row:
                         tmp.append(item)
 
-                    data_rows.append(dict(zip(columns, tmp)))
+                    data_rows.append(dict(list(zip(columns, tmp))))
 
                 # sort data according to the date 'DATUM_VZNIKU'
                 if 'DATUM_VZNIKU' in data_rows[0]:

budovySearchForm.py

@@ -21,11 +21,14 @@
  *                                                                         *
  ***************************************************************************/
 """
+from builtins import str
 
-from PyQt4.QtGui import *
-from PyQt4.QtCore import QAbstractItemModel
+from qgis.PyQt import QtGui, QtWidgets
+from PyQt5.QtGui import *
+from PyQt5.QtWidgets import *
+from qgis.PyQt.QtCore import QAbstractItemModel
 
-from ui_budovysearchform import *
+from .ui_budovysearchform import *
 
 
 class BudovySearchForm(QWidget):
@@ -40,13 +43,13 @@ def __init__(self, parent=None):
         self.__mZpusobVyuzitiModel = QAbstractItemModel
 
     def domovniCislo(self):
-        return unicode(self.ui.cisloDomovniLineEdit.text()).strip()
+        return str(self.ui.cisloDomovniLineEdit.text()).strip()
 
     def naParcele(self):
-        return unicode(self.ui.naParceleLineEdit.text()).strip()
+        return str(self.ui.naParceleLineEdit.text()).strip()
 
     def lv(self):
-        return unicode(self.ui.lvBudovyLineEdit.text()).strip()
+        return str(self.ui.lvBudovyLineEdit.text()).strip()
 
     def setZpusobVyuzitiModel(self, model):
         """