Updated xml address space addon. Added tests for it. Xml address space moved to separate makefile to reduce time of tests.
xml address space.
Updated assining and copy contructor of Variant to avoid recursion.
Parses id and class of the node in xml.
Added parsing brows_name of xml node.
Added parsing of display_name xml tag.
Added write mask to xml node.
added all attributes except data type. It hasto be calculated from value attribute.
Refactored xml loader.
Updated Variant comparation.
Variant type from EXPANDED_NODE_ID changed to NODE_ID during intializing from NodeID.
Updated xml loading tests.
Finished parsing node in xml loader.
Added namespace and two types of node id: numeric and string.
Added loading of references.