pllolcode - pllolcode: Explicit typecasting functions, comparison

Log Message:
-----------
Explicit typecasting functions, comparison functions, and arithmetic functions now work. Still need to test arithmetic
andcomparison functions to ensure proper implicit typecasting and other type-related behaviors 

Modified Files:
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    pllolcode:
        DOC (r1.15 -> r1.16)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pllolcode/pllolcode/DOC.diff?r1=1.15&r2=1.16)
        gram.y (r1.20 -> r1.21)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pllolcode/pllolcode/gram.y.diff?r1=1.20&r2=1.21)
        pllolcode.c (r1.12 -> r1.13)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pllolcode/pllolcode/pllolcode.c.diff?r1=1.12&r2=1.13)
        pllolcode.h (r1.17 -> r1.18)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pllolcode/pllolcode/pllolcode.h.diff?r1=1.17&r2=1.18)
        pllolcode_symbol.c (r1.9 -> r1.10)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pllolcode/pllolcode/pllolcode_symbol.c.diff?r1=1.9&r2=1.10)
        scan.l (r1.15 -> r1.16)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pllolcode/pllolcode/scan.l.diff?r1=1.15&r2=1.16)
        testFuncs.sql (r1.2 -> r1.3)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pllolcode/pllolcode/testFuncs.sql.diff?r1=1.2&r2=1.3)