Fixes #3079 : ad a popup for warning when we change a group
Refs #3079 Refs #3081 : correct the wording in the modification popup for group
Merge pull request #44 from ncharles/ust_3074/dev/3079_add_a_popup_listing_modified_rules_when_updating_a_group

Fixes #3079 : ad a popup for warning when we change a group