GEOS-6011: CSW: publish records for layer groups too
Support CSW requests with different types in query and in outputschema.
GEOS-6012: Automatically link CSW (ISO) records to the respective WMS/WFS/WCS sources
CSW: add test for unsupported outputschema
CSW: wms link in DC out of box mapping
Merge pull request #358 from geoserver/cswtest

CSW: backport all recent patches