[PATCH] Properly work around 1816: Reduce the linewidth by 1mm

[Reinhold Kainhofer]

Please review:
http://codereview.appspot.com/4940043

Fix 1816: Lilypond-book: Give images 1mm less linewidth

lilypond creates images that are wider than allowed (~0.5-1mm too wide, e.g. 
160.51mm instead of 160mm), so
workaround this by removing 1mm from the linewidth.

Also remove code that makes the fragment snippet option imply
ragged-right. Since single-line snippets are now formatted
ragged-right anyway by default in lilypond, we don't need to set
this explicitly. And multi-line snippets are usually not desired
to be printed ragged-right.

Cheers,
Reinhold
-- 
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Reinhold Kainhofer, address@hidden, http://reinhold.kainhofer.com/
 * Financial & Actuarial Math., Vienna Univ. of Technology, Austria
 * http://www.fam.tuwien.ac.at/, DVR: 0005886
 * LilyPond, Music typesetting, http://www.lilypond.org