Preprocess script

[Andrea 'fwyzard' Bocci]

Hi,
I've modified the proprocess script with the XHTML validation procedures.
Now it supports 3 validation engins: 2 webbased (W3C e WDG) and a local 
validator (I use alocal copy of the WDG validator).
I've tried to keep everything as simple as possible, adding some desciption 
to all the functions and a help output.

I'e tested it both locally and with the remote validators, and it looks 
sane to me.
Tell me your opinions on this one, if you like it or if you'd rather have 
any changes to it.

.fwyzard.
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