[xml] Removed writing of web-based xsd reference in GML and STN files.

Applications/FileIO/XmlIO/Qt/XmlPrjInterface.cpp

GeoLib/IO/XmlIO/Boost/BoostXmlGmlInterface.cpp

GeoLib/IO/XmlIO/Qt/XmlGmlInterface.cpp

GeoLib/IO/XmlIO/Qt/XmlStnInterface.cpp

...eometric-object-to-the-surface-of-a-mesh/TestPolyline.gml

...reparation/set-properties-in-polygonal-region/Regions.gml

...tion/set-properties-in-polygonal-region/TestPolylines.gml