python - be: Implement array(MD) interfaces.

Log Message:
-----------
Implement array(MD) interfaces.

Provides a very convenient mechanism for creating arrays from sequences of
sequences. This allows users to create arrays without having to use the array
syntax(avoids annoying escaping).

Partially incomplete; the slicing interface seems oddly broken, so it will
either be fixed or cut in 0.3.

Modified Files:
--------------
    be/include/pypg:
        postgres.h (r1.10 -> r1.11)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/include/pypg/postgres.h.diff?r1=1.10&r2=1.11)
    be/src:
        type.c (r1.18 -> r1.19)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/src/type.c.diff?r1=1.18&r2=1.19)
    be/src/type:
        array.c (r1.3 -> r1.4)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/src/type/array.c.diff?r1=1.3&r2=1.4)