Revision 1653489

FELIX-4644 - stricter parsing of MetaType files:

- do some additional validations on the number of allowed elements
  in a MetaType during the parsing. For example, only allow exactly
  one Object in a Designate or at least one AD for MetaType files
  with a namespace version less than 1.3; 
- expose the namespace of the metatype file so it can be used for
  external validation purposes.