orafce - orafce: support mb strings

Log Message:
-----------
support mb strings

Modified Files:
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orafce:
README.orafunc (r1.12 -> r1.13)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/orafce/orafce/README.orafunc.diff?r1=1.12&r2=1.13)
alert.c (r1.4 -> r1.5)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/orafce/orafce/alert.c.diff?r1=1.4&r2=1.5)
plvstr.c (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/orafce/orafce/plvstr.c.diff?r1=1.2&r2=1.3)