Fix 2732: Extract the full page geometry in lilypond-book (issue 6454139)

[dak]

http://codereview.appspot.com/6454139/diff/1/python/book_latex.py
File python/book_latex.py (right):

http://codereview.appspot.com/6454139/diff/1/python/book_latex.py#newcode262
python/book_latex.py:262: textwidth = (textwidth + columnsep) / columns
- columnsep
Why not use the value of \columnwidth in the first place here?  Note
that this does not help with full-width figures:
\begin{figure*}
...
\end{figure*}

http://codereview.appspot.com/6454139/diff/1/python/book_snippets.py
File python/book_snippets.py (right):

http://codereview.appspot.com/6454139/diff/1/python/book_snippets.py#newcode128
python/book_snippets.py:128: MARGIN_LEFT: r'''left-margin =
%(left-margin)s''',
I have a hard time imagining the margins to make any sense since TeX
applies them to the included material anyway.

http://codereview.appspot.com/6454139/