parallel-music - still not R5RS compliant

[Bertalan Fodor]

We've had a conversation with Nicolas in May, summarizing:

//(apply for-each (lambda (. seqs)
////does not work on my java-based R5RS parser

Nicolas wrote:

//You're right, I've been lazy, and scheme gets on my nerves sometimes.
It should be (lambda* (#:rest seqs) ...), having
(use-modules (ice-9 optargs)) before.


http://lists.gnu.org/archive/html/lilypond-devel/2006-05/msg00180.html

Could you please apply this to music-functions-init.ly, if possible and 
also backport it to 2.8

Thanks,

Bert