qtclient: more backports from configurator, all of them need manual porting
into the qtwizvis branch or are already solved there (like the running requests)
Merge branch 'master' into qtwizvis

Conflicts:
	clients/qt/DataHandler.cpp
	clients/qt/FileDataLoader.cpp
	clients/qt/FormWidget.cpp
	clients/qt/NetworkDataLoader.cpp
	clients/qt/NetworkDataLoader.hpp

All dropped.