LIBRARY_PATH_PLACEHOLDER

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.

RequestACL as a result of review.

to configure.ac to ensure all necessary .py and .so will be installed
in the correct place.  also added missing files to Makefile.am to fix
distcheck failures.

also did some cleanups.

added constructor and __str__() with tests for the constructor.

going to depend on libacl.