orafce - orafce: standardized error messages some corrections and source

Log Message:
-----------
standardized error messages
some corrections and source code cleaning
new oracle compatible substr functions

Modified Files:
--------------
    orafce:
        README.orafunc (r1.14 -> r1.15)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/orafce/orafce/README.orafunc.diff?r1=1.14&r2=1.15)
        alert.c (r1.5 -> r1.6)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/orafce/orafce/alert.c.diff?r1=1.5&r2=1.6)
        orafunc.sql (r1.11 -> r1.12)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/orafce/orafce/orafunc.sql.diff?r1=1.11&r2=1.12)
        orafunc.sql.in (r1.18 -> r1.19)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/orafce/orafce/orafunc.sql.in.diff?r1=1.18&r2=1.19)
        pipe.c (r1.10 -> r1.11)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/orafce/orafce/pipe.c.diff?r1=1.10&r2=1.11)
        pipe.h (r1.2 -> r1.3)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/orafce/orafce/pipe.h.diff?r1=1.2&r2=1.3)
        plvdate.c (r1.4 -> r1.5)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/orafce/orafce/plvdate.c.diff?r1=1.4&r2=1.5)
        plvstr.c (r1.3 -> r1.4)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/orafce/orafce/plvstr.c.diff?r1=1.3&r2=1.4)
        putline.c (r1.5 -> r1.6)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/orafce/orafce/putline.c.diff?r1=1.5&r2=1.6)
        shmmc.c (r1.6 -> r1.7)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/orafce/orafce/shmmc.c.diff?r1=1.6&r2=1.7)
        shmmc.h (r1.3 -> r1.4)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/orafce/orafce/shmmc.h.diff?r1=1.3&r2=1.4)