plpsm - plpgpsm: merge last patches from plpgsql

Log Message:
-----------
merge last patches from plpgsql

Modified Files:
--------------
    plpgpsm/src:
        gram.y (r1.57 -> r1.58)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plpsm/plpgpsm/src/gram.y.diff?r1=1.57&r2=1.58)
        pl_comp.c (r1.24 -> r1.25)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plpsm/plpgpsm/src/pl_comp.c.diff?r1=1.24&r2=1.25)
        pl_funcs.c (r1.12 -> r1.13)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plpsm/plpgpsm/src/pl_funcs.c.diff?r1=1.12&r2=1.13)
        plerrcodes.h (r1.2 -> r1.3)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plpsm/plpgpsm/src/plerrcodes.h.diff?r1=1.2&r2=1.3)
        plpgpsm.h (r1.46 -> r1.47)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plpsm/plpgpsm/src/plpgpsm.h.diff?r1=1.46&r2=1.47)