pgsql: PL/Python regression tests for data type handling Add some

Log Message:
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PL/Python regression tests for data type handling

Add some checks on various data types are converted into and out of Python.
This is extracted from Caleb Welton's patch for improved bytea support,
but much expanded.

Modified Files:
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    pgsql/src/pl/plpython:
        Makefile (r1.33 -> r1.34)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpython/Makefile?r1=1.33&r2=1.34)

Added Files:
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    pgsql/src/pl/plpython/expected:
        plpython_types.out (r1.1)

(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpython/expected/plpython_types.out?rev=1.1&content-type=text/x-cvsweb-markup)
    pgsql/src/pl/plpython/sql:
        plpython_types.sql (r1.1)

(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpython/sql/plpython_types.sql?rev=1.1&content-type=text/x-cvsweb-markup)