share autocomplete - improve group appearance - issue #173

Fix instanceid format to prevent session loop

Make it possible to show less log entries again

User list: Keep array of available groups. Should fix #873

Fix install app version check

Fix upload progressbar in IE8 and IE9

Use displayName in the From field of outbound email about new shares.

This is important in the Active Directory case where users are
currently getting a GUID in the From field, making emails look quite a
lot like spam.

 * show "less" button only if there are more than 3 entries
 * only "remove" logs till last 3 entries

instanceid is generated by uniqid() and then used as the
session_name. Because session_name requires at least one letter
and uniqid() does not guarantee to provide that, in the case that
uniqid() generates a string of only digits, the user will be stuck
in an infinite login loop because every request will generate a
new PHP session.

prevent to fire delete ajax a second time.