gram.y=>preproc.y

The attached version now is able to generate an ecpg parser without a single
change in gram.y. Also included is a perl version of the script created by a2p
and fixed by me. Unfortunately a2p did not generate working code, so I guess
eventually we have to only work with the perl version. I guess a perl hacker
can beautify the script quite a bit.

Anyway, it does work, regression tests run through (need to update expected
results though). So guys, now's the time to test before it makes it into the
archive. :-)

Michael

--
Michael Meskes
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