python - fe: Set of changes.

Log Message:
-----------
Set of changes.

- Remove use of gt.abstract; Transaction is now built-in as TransactionManager.
- Identify array types whose element type do not support binary I/O.
- Rewrite iter_row_pack as a generator.
- Refactor Portal into three classes, Portal--base class, Cursor--server
  instantiated Portals, and ClientStatementCursor--ClientStatement instantiated
  Portals. This allows for some conditions to be removed w.r.t. the portal_id.
- Stop quoting the value in RuntimeParameter inspired set statements. :(
- Add anonymous row type support(all we have is the type oid, but that's enough)
- Other minor changes.

Modified Files:
--------------
    fe:
        setup.py (r1.9 -> r1.10)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/fe/setup.py.diff?r1=1.9&r2=1.10)
    fe/src:
        tracenull.py (r1.36 -> r1.37)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/fe/src/tracenull.py.diff?r1=1.36&r2=1.37)