lilypond-book refactor patch

[John Williams]

Thanks for including my bugfixes in the latest release.

This patch looks large, but mainly it is just moving code around.

It refactors the compose_ly procedure, making it into a method of
the Lilypond_snippet class.  The option processing is broken off
the start of compose_ly and put into a do_options method.

This allows the fully parsed options to be accessed by other methods
of the class.  This is needed for some of the patches which follow this.

This patch should change no existing functionality, but it makes doing the
rest of the patches I am submitting a lot easier.

~ John Williams

refactor.patch
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