Get rid of the Trace ParamContext and give python direct

access to enabling/disabling tracing.  Command line is
unchanged except for the removal of --trace-cycle since
it's not so clear what that means.

--HG--
extra : convert_revision : c0164d92d3615d76d0c6acaabaafd92a9278212a

src/python/SConscript

@@ -108,6 +108,7 @@ def swig_it(basename):
 swig_it('main')
 swig_it('debug')
 swig_it('event')
+swig_it('trace')
 
 # Action function to build the zip archive.  Uses the PyZipFile module
 # included in the standard Python library.