plpsm - plpgpsm: enhanced diagnostics for warnings

Log Message:
-----------
enhanced diagnostics for warnings

Modified Files:
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plpgpsm/src:
pl_exec.c (r1.44 -> r1.45)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plpsm/plpgpsm/src/pl_exec.c.diff?r1=1.44&r2=1.45)
plpgpsm.h (r1.35 -> r1.36)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plpsm/plpgpsm/src/plpgpsm.h.diff?r1=1.35&r2=1.36)