Log Message:------------ improve errcode and error messages
Modified Files:-------------- pgrpm: ChangeLog (r1.11 -> r1.12) (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgrpm/pgrpm/ChangeLog.diff?r1=1.11&r2=1.12) pgheader.c (r1.29 -> r1.30) (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgrpm/pgrpm/pgheader.c.diff?r1=1.29&r2=1.30)