Based on contributed patch from Martin Friebe, CLA from 2007-02-24.

The parser lacked support for field sizes after signed long,
when it should extend to 2**32-1.

Now, we correct that limitation, and also make the error handling
consistent for casts.
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Fix minor complaints of Marc Alff, for patch against B-g#15776.
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Merge zippy.cornsilk.net:/home/cmiller/work/mysql/bug15776/my50-bug15776
into  zippy.cornsilk.net:/home/cmiller/work/mysql/bug15776/my51-bug15776
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Merge zippy.cornsilk.net:/home/cmiller/work/mysql/bug15776/my51-bug15776
into  zippy.cornsilk.net:/home/cmiller/work/mysql/mysql-5.1-build
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testing