update git ignore
better removing and file coping
Update folder deletion
Add the calculation of the source folder
Merge branch 'CheckFreeSpace' into Progression

Conflicts:
	MainWindow.cpp
can now display progression
ProgressBar know works well for folders
fix conflict
Merge branch 'EjectDevice'

Conflicts:
	MainWindow.cpp
Merge branch 'Progression'

Conflicts:
	MainWindow.cpp
add the about box