Add the support of the gYear primary type

Reference : http://books.xmlschemata.org/relaxng/ch19-77127.html
Set namespace on attributeGroup when parsing it in schema.

Same fix as for groups.
Making KDSoapServerSocket available from KDSoapServerObjectInterface
Adapting the parseComplexContent to the new namespace handling in parseAttributeGroup

Support of attributeGroup when the parent tag is complexContent.