Add group, delete group, delete user OK.
Merge pull request #63 from adoulrac/selim/picturesDisplay

Code review. Doc review. Window icon added. Label published by centered.
Additional tabs are now closable
Merge pull request #64 from adoulrac/rachid/release2

Additional tabs are now closable
Conflicts solved.
Merge pull request #62 from adoulrac/arthur/gestion_groupes

Add group, delete group, delete user OK.
Merge pull request #65 from adoulrac/rachid/release2

Bug fix about pictures requests
Bug fix about pictures requests
Picture controlelr code review
Merge pull request #66 from adoulrac/rachid/release2

Picture controlelr code review
Synchro. with DATA