Non-backwards compatible changes

The constraints imposer incorrectly handled existence and cardinality, using cardinality instead of existence. This has been changed to reflect the model: existence now reflects if the value in the model can be null or not. Before, this incorrectly was cardinality. If you use this functionality, the behaviour changes.
the primitive node id value should be 'id9999' in the specs, but it currently was 'primitive_node_id'. This has been changed back and can break your applications

Other changes

unique paths had a space between the id-code and the number. This has been removed, so now instead of /data[id3, 1] it returns /data[id3,1]
Apath query findList now works in more cases
RMQueryContext can now retrieve the path of a given RMObject from the given root. This is experimental and will probably not work in all cases with leaf nodes - should work with all locatables or pathables.
test coverage has been increased
interval and MultiplicityInterval have some extra convenience methods added