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.

prevent to fire delete ajax a second time.

Properly prepare insertIfNotExist queries.

Before the click on a single file delete icon fired two different handlers - one of them is for multiple deletion only

Implement setting custom domainname for getDefaultEmailAddress

let public link download handle json encoded file lists [master]

see #2568

Move testcase for getDefaultEmailAddress with mail_domain set in config.php to own test function.