documentation update

[Joshua Daniel Franklin]

I've updated the documentation build in the Cygwin CVS and for the first
time you can build the Cygwin documentation using packaged tools.

You need to have the docbook-xml42, docbook-xsl, and xmlto packages 
installed. 

I will be preparing a new release cygwin-doc in the next few days. 
Unless there are a lot of complaints here, I'll probably drop the txt format 
since it's easy to get a plain-text version from the HTML with lynx -dump.

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