optimize WFS detection in CSW parser

[azahnen]

As of now there are three ways a WFS might be detected:

• SV_ServiceIdentification/containsOperation contains an operation with operationName "GetCapabilities" and
  • either SV_ServiceIdentification/serviceTypeVersion contains "WFS"
  • or connectPoint/.../protocol contains "WFS"
  • or connectPoint/../URL contains "service=wfs" and "request=getcapabilities"

The detected URL for any case is the OnlineResource of the GetCapabilities operation.

Another way to find WFS URLs which is at least used in the Netherlands would be to look in the MD_Distribution/transferOptions for OnlineResources with a protocol that contains "WFS".