Fix for broken Mail App in OSX Mountain Lion. https://mail.kde.org/pipermail/owncloud/2012-August/004649.html

For example this can happen if the sync client is used before the user created the root directory (e.g. through web login).

use CURRENT_TIMESTAMP in default column definitions (sqlite, mysql, postgres and oracle DO understand it), change clob columns to text (clob will give sorting and uniqueness problems and in general is not what we want)

remove superflous index (already indexed with primary key derived from <autoincrement> by MDB2), oracle will bark on this

Conflicts:
	apps/media/lib_ampache.php

Conflicts:
	lib/filesystemview.php

Conflicts:
	settings/personal.php

Conflicts:
	settings/personal.php

Conflicts:
	lib/filesystemview.php

Check if user is already logged in for DAV auth, instead of logging in and creating new sessions for every request