python - ip: Remove 'Mechanics' sections.

Log Message:
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Remove 'Mechanics' sections.

While noble, these authoritative sections merely added to the difficulty of
maintaining this document. Really, it should be a simple design document that
can be read as documentation. Also, it should be easy to alter as well in order
to expedite changes. [ie, it's too painful with too little benefit]

Also,

- Add a section describing gtx_pythons (pb_python, pg_python commands)
- Describe the Transaction object's protocol.
- Begin describing the Connection object's protocol.

With the removal of the mechanics section, some of these areas should probably
be expanded, but really they were fairly well inline with what was described.

Modified Files:
--------------
ip:
LICENSE (r1.1.1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/ip/LICENSE.diff?r1=1.1.1.1&r2=1.2)
spec.xml (r1.5 -> r1.6)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/ip/spec.xml.diff?r1=1.5&r2=1.6)
ip/env:
validator.xml (r1.1.1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/ip/env/validator.xml.diff?r1=1.1.1.1&r2=1.2)