Fixed various file name escaping issues in core apps

- Refactored file tr lookup into FileList.findFileEl that uses
  filterAttr to avoid escaping issues in jQuery selectors
- Fixed versions and sharing app to properly escape file names in
  attributes

Removed special handling of part files in shared storage rename

Fixing apache login

add command line option to get user number statistics

This fixes the issue introduced by the transfer id which itself wasn't
taken into account by the shortcut code for part file in the shared
storage class.

Fix ownCloud for php5.3.x

Prevent deleting storage root

Storage mount points are not deletable, so make sure that the unlink
operation and its hooks aren't run in such cases.

Note that some storages might recursively delete their contents when
calling unlink on their root. This fix prevents that as well.

Enforce required phpunit version

LDAP: implement userCount action. This required to (finally) clean up and refactor the search method, which will have a positive performance impact on paged search.

turn off mod_pagespeed

Added ownCloud backend for external storage

Fix submodule 3rdparty - translation sync broke that

Now also preventing to override "files" dir size with -1

Kill index.php from url

enable ldap tests

Fixes #6526

Fixing disabled function checks

Files androidcontentdisposition

Update sabre dav to 1.7.9

remove duplicate exe mimetype, add correct msi mimetype