Implementation of full-screen mode
The GUI now has a full-screen mode that will maximise the SoFiA window, available either through the Settings menu item or by pressing F11. This is useful for presentation purposes or on machines with small screens.
Explain full-screen mode in user manual
Improved icon handling in GUI
Added new icon files
Merge branch 'master' of https://github.com/SoFiA-Admin/SoFiA into HEAD