In File/Share, disable "Add Group" if user has no groups
Also set the button title to "You do not have any groups".Refs #3575
New button "Add everybody" to file Share dialog
Refs #3575
In Share Dialog, remove the header line when the permission list is empty.
Change wording: Sharing -> Share in the folder context menu
Update permission table after adding user/group
Rename constructor params
Unify 'Publish' and 'Sharing' dialogs into one (for files)
Add more logging utilities
Provider a safer way to purge the container
Refs #3443https://code.grnet.gr/issues/3443
Enhance logging
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