Merge branch 'release-2.2'
* release-2.2: (213 commits)
Bump version for 2.2.1-pl release
Fix uninstalled state to report 503 error
[xPDO] Updated xPDO to 2.2.4-pl release
Override modAccess->getOne for Principal aggregate
Add Group/UserPrincipal aggregates to modAccess
Fix CSS for windows
[#7387] Add New Category button to Element tree toolbar
[#7518] Fix issue that prevented absolute URLs in media-source bound TVs
[#7521] Allow filtering of usergroup by request on users page
Update of Czech translation
Oprava 'kriticke chyby'
Correction of Czech translation
Correction of Czech translation in settings
Refactor aggregate/composite criteria support
Remove deprecated comments
[ReUp] Add assets_path field to modNamespace
Fix xPDOObject::_loadInstance for graph objects
Refactor schema parsing using SimpleXML
Translated new phrases in default.inc.php and user.inc.php to German
Scale back prior commit a bit to prevent issues with field loading
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