Ftools-Sum Line length - Fix progress bar
[FEATURE] Add DataUrl to layer's metadata

Like keyword list, attribution and metadata url, this information is
used by QGIS Server in WMS GetCapabilities and GetContext Request.
The user can add an url where he can find information about the layer.
Monkey patch __nonzero__ onto QPyNullVariant for easier null check.

Who doesn't love monkeys :)
[DB Manager] fix for PostGIS Raster Layer
Merge pull request #651 from slarosa/fix_dbmanager

[DB Manager] fix for PostGIS Raster Layer
Use python None object for NULL attributes
Merge pull request #625 from vinayan/projcrash

[Fix #7964] Ftools-Sum Line length - Fix progress bar
Add relation manager ui

Conflicts:
	src/app/qgsprojectproperties.cpp
	src/ui/qgsprojectpropertiesbase.ui
Add relation edit type
Remove unneeded method
Singleton
Add editor widgets wrapper
Whatever
New attribute editor API
Further widgetfactory stuff
Add new editorwidget api v2
Move to editorwidgetsv2
Make sip bindings work
Further improvments
Wow, big changes