Bugfix release:
- Download files from DAV tab without showing Zimbra warning 'Do you want to leave Zimbra?'
- Add (missing) option for adding files as regular attachments when attaching from DAV when composing mail.
- Append internal links to the current draft, instead of creating a new one when composing mail.
- In case SSL handshake fails due to missing certificate chain or untrusted certificate show a pop-up that points to the wiki.