Changed the column header to "Group Admin for" and the default value of
the multiselect box to "no group" if user is not a groupadmin for any
group.

This fixes #9367.

Remove local app settings slide logic and make it use the global one
triggered by the "data-apps-slide-toggle" attribute.

- Renamed "delete" to "deleteEntry" to make IE8 happy.
- Added missing "svg" class for the "+" button
- Added height to "+" button but was unable to properly align it

Removing code that should not have been restored.
Originally removed in 45fd8f6d.

Fixes the admin group disappearing from the list when updating the display as the result of a search.

This group data should probably be managed on the page entirely by the javascript GroupList object, but this seems like the interim method.

* Assigned jQuery selector results to variables for speed.
* Moved all .attr('data') calls to .data() calls.
* Added :data(uid) selector.
* Split the multiselect checkhandlers into separate functions.
* De-duped click event on password change/img.
* Used fluent interface on jQuery object for event binding.
* Removed redundant tag names in class selectors.
* Fixed incorrect date display for last login.
* Added Userlist.has() to search for uid.
* General code convention compliance fixes.

to-do: Group dropdowns currently don't add the admin group after the search result, not sure why yet.

move group-click initialization to groups.js and only react on elements with a data-gid attribute given

set admin gid to Admins filter. I.e. hard-coding the admin group, but this is OC reality atm - other admin groups are not possible.