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This class is designed to work with user groups.
usergroup.create- creating new user groups
usergroup.delete- deleting user groups
usergroup.get- retrieving user groups
usergroup.isreadable- checking if user groups are readable
usergroup.iswritable- checking if user groups are writable
usergroup.massadd- adding permissions and users to user groups
usergroup.massupdate- simultaneously updating multiple user groups
usergroup.update- updating user groups