data: bookmark refactoring

* implemented handling of aggregations in bookmarks
* split index Storage and bookmark storage
* each sqlite database has its own version now
* added bookmark tests
* fixed creating bookmark tables when project can be loaded but bookmark db does not exist
* fixed font size for bookmarkview tooltips
* using bookmark cache now
* using default category name when none specified by the user
* raising bookmark windows when they should be shown
* clearing a bookmark or category in the editor will now update the star icon accordingly
* non-persistent bookmarks use ids of nodes and edges now (instead of names)
* git ignore .srctrlbm files

src/test/readme.txt

@@ -0,0 +1,18 @@
+---------
+Debugging
+---------
+To debug unit tests remove the post-build event, set the execution directory for 'Coati_test' to '.../Coati/bin/test' and run 'Coati_test' as startup project
+
+
+Post build event (if you manage to delete it without saving it somewhere):
+
+setlocal
+cd $(ProjectDir)../../bin/test/
+$(OutDir)$(TargetName)$(TargetExt)
+if %errorlevel% neq 0 goto :cmEnd
+:cmEnd
+endlocal & call :cmErrorLevel %errorlevel% & goto :cmDone
+:cmErrorLevel
+exit /b %1
+:cmDone
+if %errorlevel% neq 0 goto :VCEnd