[PATCH] Add showFirstLength property

[Valentin Villenave]

Greetings,

(some day I *may* figure out how to use the online patch reviewer
thingy; I can't understand why it keeps asking me for a SVN repository
when we're using an external git repo)

Here's a patch to music-functions.scm in order to add the
showFirstLength property that many LilyPonders (well, myself at least
:-) need. It also updates the documentation, and the relevant regtest.

This property is overriden by showLastLength, so both cannot be used
at the same time -- however, I can hardly imagine a situation where
one would need both.

Here's the thing: when you already have a full piece, and decide to
add a drum part to it, showLastLength will not show you the first bars
where you've added drums. Therefore you need this property; another
real-world situation I can imagine is when you have a \book with many
\scores in it, and want to print an index containing only the
beginning of each piece.

Please review it and apply if relevant.

Cheers,
Valentin

0001-Added-showFirstLength-feature.patch
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