pllolcode - pllolcode: Make arithmetic stuff pay more attention to

Log Message:
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Make arithmetic stuff pay more attention to operand data types. Still needs testing, esp. because it's tough to get
anythingother than a YARN in the current setup. 

Modified Files:
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    pllolcode:
        gram.y (r1.19 -> r1.20)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pllolcode/pllolcode/gram.y.diff?r1=1.19&r2=1.20)
        pllolcode.c (r1.11 -> r1.12)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pllolcode/pllolcode/pllolcode.c.diff?r1=1.11&r2=1.12)
        pllolcode.h (r1.16 -> r1.17)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pllolcode/pllolcode/pllolcode.h.diff?r1=1.16&r2=1.17)
        pllolcode_symbol.c (r1.8 -> r1.9)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pllolcode/pllolcode/pllolcode_symbol.c.diff?r1=1.8&r2=1.9)