Fixes #3847: Add version 3.0 with optional option to set GID at group creation
Merge pull request #288 from VinceMacBuche/ust_3843/dev/3847/handlegid_group_management

Fixes #3847: Add version 3.0 with optional option to set GID at group cr...
Merge branch 'branches/rudder/2.6' into branches/rudder/2.8
Fixes #4471: backup file /etc/group before updating it
Merge pull request #291 from ncharles/bug_4471/dev/save_etc_group_to_repository

Fixes #4471: backup file /etc/group before updating it
Merge branch 'branches/rudder/2.6' into branches/rudder/2.8
Merge branch 'branches/rudder/2.8' into branches/rudder/2.9