Issue 800 melisma extenders

[Nicolas Sceaux]

Hi,

As was reported on <http://code.google.com/p/lilypond/issues/detail?id=800 
>
a regression was introduced by patch  
7531ea6b3bb254f4d82aabde347a91671533b45a:

    Fix lyric extenders to end properly when there are notes but no  
more lyrics.

    The previous extender code only ends extenders when the next
    lyric is encountered. This can lead to issues when there are  
additional note
    but no more lyrics. This patch adds a check to see if a
    melisma is ending, completetizing the extender if appropriate.

As this patch aims at fixing a robustness, somewhat unusual, case, and  
breaks
the general behavior of melisma extender lines, may I propose to  
revert this patch?
It's really annoying.

Nicolas