Generate the book in XHTML instead of HTML

[C. Michael Pilato]

Øyvind A. Holm wrote:

>Marcus Rueckert (darix) came with a solution on irc which makes xsltproc 
>generate XHTML instead of HTML. This generates UTF-8 output instead of 
>ISO-8859-1, which is a Good Thing in the long term when books in 
>non-Western languages will be built. The HTML which is generated now 
>also lacks a proper DOCTYPE declaration, which the XHTML version has. In 
>addition, the XHTML version has proper indents in the header which makes 
>it way more readable. The size doesn't increase much, less than 6k in 
>the Norwegian single-page XHTML file. I have tested the patch with make 
>all, and XHTML, PostScript and PDF generation works fine.
>  
>
If this works, and you haven't already committed it (and I just missed 
it), I say go for it!

Also, do you (or other translation owners) have any thoughts on a 
unified build system?  Seems silly that I can't run 'make' the 'src' 
directory and get PDF, XHTML, and chunk-XHTML for all translations.