Merge pull request #61 from adoulrac/smandrau/release2

Add Javadoc: Javadoc added (+minor refactoring)
Updated javadoc
Updated javadoc
Merge branch 'master' of github.com:adoulrac/IHM into smandrau/release2
Add enter key listener on login
Add group, delete group, delete user OK.
Code review. Doc review. Window icon added. Label published by centered.
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
Merge pull request #67 from adoulrac/selim/picturesDisplay

Synchro. with DATA
Bug fix in stub
Merge pull request #68 from adoulrac/selim/release2

Bug fix in stub