new cwm release

I have just made a new release of cwm.  Functionalty is basically the same,
but code is better inside.  List handling should be improved.  Formulae
are interned and can therefore be compared and matched in queries.
Hmmm. must add tests for that.

-rdf=d   option now allows one to stop the rdf/xml serialization using
              default namespaces, as requested by Norm Walsh.

-n3=d   option the same fro n3 output.

 Also, a bug which Norm mentioned should be fixed, with
  XML output trying to use default namesapces on attributes.
Regression test now includes this bug check.

Tim