pllolcode - pllolcode: Add support for NOOB values and NULL input

Log Message:
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Add support for NOOB values and NULL input values, document what I need to do to support NULL return values

Modified Files:
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pllolcode:
gram.y (r1.18 -> r1.19)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pllolcode/pllolcode/gram.y.diff?r1=1.18&r2=1.19)
pllolcode.c (r1.9 -> r1.10)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pllolcode/pllolcode/pllolcode.c.diff?r1=1.9&r2=1.10)
pllolcode.h (r1.15 -> r1.16)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pllolcode/pllolcode/pllolcode.h.diff?r1=1.15&r2=1.16)
pllolcode_symbol.c (r1.7 -> r1.8)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pllolcode/pllolcode/pllolcode_symbol.c.diff?r1=1.7&r2=1.8)
testFuncs.sql (r1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pllolcode/pllolcode/testFuncs.sql.diff?r1=1.1&r2=1.2)