majalan

Copperbox revision 3236.

Some tidying up.

I've started to work on a longer example (nothing substantial to commit to Copperbox yet) as a means to evaluate whether the abstractions in Majalan.Base are useful, expressive, etc. This round of tidying up is the first action resulting from working on the longer example. Another problem it has identified is that impulses add too much clutter - having just one notelist like object generating impulses is probably sufficient.