pgsql: Clean up signedness warnings and 64-bit bugs in recent psql

Log Message:
-----------
Clean up signedness warnings and 64-bit bugs in recent psql printing
patch.  Martijn van Oosterhout and Tom Lane

Modified Files:
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    pgsql/src/bin/psql:
        mbprint.c (r1.19 -> r1.20)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/mbprint.c.diff?r1=1.19&r2=1.20)
        print.c (r1.81 -> r1.82)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/print.c.diff?r1=1.81&r2=1.82)