plpsm - plpgpsm: scrollable cursor support and move statement

Log Message:
-----------
scrollable cursor support and move statement

Modified Files:
--------------
plpgpsm/src:
gram.y (r1.56 -> r1.57)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plpsm/plpgpsm/src/gram.y.diff?r1=1.56&r2=1.57)
pl_exec.c (r1.59 -> r1.60)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plpsm/plpgpsm/src/pl_exec.c.diff?r1=1.59&r2=1.60)
plpgpsm/src/expected:
plpgpsm.out (r1.20 -> r1.21)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plpsm/plpgpsm/src/expected/plpgpsm.out.diff?r1=1.20&r2=1.21)