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which is not (at least yet) applicable.  also added a note about the
difference between the C++ doc and the python version derived from it.

- explicitly imports the json module in __init__.py (this should actually be
  done at the isc package level, but we now don't rely on the implicit
  side effect).
- get the reference to the dumps() callable at the RequestLoader initialization
  time and keep it thereafter.  This would also slightly improve runtime
  performance.

so that *not* using it must be specified explicitely
changed most test cases to not set it (as they are testing other things)

in load()

which will be used for the remaining work in trac983.

the only exposed interface is load() right now.
also made overall document cleanup/enhancements.

generating pydoc in the python API implementation.

must be specified explicitly.

there doesn't seem to be a simple and portable way to allow direct sharing,
so I chose to get access to the variables via the python interpretor.

seem to like this type of mismatch.   Since the function is very short,
removing this const wouldn't matter much.

in Makefile.am for python tests.

RequestACL as a result of review.