Harmonize functions to parse epsg codes from WFS GetFeature requests and support different variants for expressing epsg codes.
Support for CRS URI format http://www.openis.net/gml/srs/epsg.xml#xxx as specified in WFS
Segfault resolved when parsing srsName in WFS spatial filter.
Merge pull request #4381 from faegi/ogcParseEpsgCodes

Support for epsg codes as OGC URN expression in OGC filter encoding; redundant code removed.