fix: use print_escaped for radio button "checked"

use of p() results in escaped HTML code: checked=&quot;checked&quot;
where it should be: checked="checked"
we first shall check if the current session is valid - otherwise the session-id will be regenerated on login via basic auth
fixing ident
we need the file_source to delete a share successfully
Merge pull request #7632 from owncloud/fix-7582-master

we first shall check if the current session is valid - otherwise the ses...
if file is not in db, fall back to restore file to the users root
only enable previews if the encryption is disabled
get trash size from file cache
fix mimetype detection, introduce fake etag to identify preview images
Merge pull request #7398 from owncloud/trash_dont_rely_on_db

[trash] fall back if file is not in db
Merge pull request #7646 from owncloud/fix_ocs_api_unshare

we need the file_source to delete a share successfully
Merge pull request #7600 from ideaship/fix_escaped_html

fix: use print_escaped for radio button "checked"
Merge branch 'master' into close-session-faster-master
PHPDoc updated