Tracker 836: Add facility to change output file-name for a \book block

[ian_hulin]

Reviewers: Neil Puttock,

Description:
Tracker 836: Add facility to change output file-name for a \book block

or to set a suffix to prevent multiple files over-writing each other
during
a compilation.
This change allows user to to this via functions rather than having to
do
so by manipulating semi-documented parser variables.

ignore .gitignore

Please review this at http://codereview.appspot.com/144047

Affected files:
   M .gitignore
   M lily/parser.yy
   M ly/init.ly
   M ly/music-functions-init.ly
   M scm/lily-library.scm




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