gnucash-docs changes

[Chris Lyttle]

Hi all,

I've been working here on updating the -docs build for a release. I've 
so far made the following changes (not committed yet);

a) removed checks for anything to do with using the doc-tools directory.
b) removed the making of html files from 'make' and made a new target 
called 'make html' to make and install those files still.

I haven't committed this to svn yet as I still have some tweaks to get 
it to work properly, but I wanted to let you all know and solicit 
feedback on these changes.

Chris