#GH376 - changes after review

Replace Alert with MessageBox;
Close MessageBox only if the reset doesn`t fail
Change label
GH 376 - Use GitCategoty for visibility
#GH376 - Populate tree using Git Node
Merge remote-tracking branch 'origin/master' into GH376-reset-review

Conflicts:
	org.flowerplatform.flex_client.team.git/.flexLibProperties
#GH376 - update the nodes after reset
Merge remote-tracking branch 'origin/GH376-reset-review'
#376 - final code corrections after review