[encryption] improved error handling during password change

Remove all occurences of @brief and @returns from PHPDoc

* test case added to avoid adding them later

Command line tool to convert current database to others, except sqlite

Expose permission via WebDAV

Allow apps to create custom session handlers.

PHPDoc improvements /apps

* owncloud/phpdoc-improvements-apps:
  Fix whitespace issues
  Reduce double-space with single-space.
  Remove spaces around | operator in doc block.
  Fix more missing or broken PHPDoc
  PHPDoc fixes for user_ldap
  Fix PHPDoc in /apps

Some more global definition to autogenerate a "Shared by Link" with token! Why we not add these lines for more global use of the public service feature? At the moment there is a pr for sharing a calendar by Link. With this little mod the calendar can work with the core share api and needs no own js share definition!

Set expiration date by default when adding additional shares

Fix #4823

Optimize some queries that are always executed when loading base.php

Disable login button until the timezone is set

SVG fallback for a few icons

use default expire date only for link shares

allow admin to enforce passwords for public link shares

Fix drag and drop in IE8

Files app navigation sidebar

For some reason IE8 didn't like the sort function, so using the one from
underscore instead.

- fixed upload and storage statistics
- fixed infinite scroll to use the correct contain for scroll detection
- fixed unit test that sometimes fail for rename case
- controls are now sticky again
- fixed selection overlay to be aligned with the table
- fixed "select all" checkbox that had id conflicts
- fixed public page
- fixed global actions permissions detection
- fix when URL contains an invalid view id
- viewer mode now hides the sidebar (ex: text editor)
- added unit tests for trashbin
- clean up storage info in template (most is retrieved via ajax call now)