SCM-ification of parser

[Erik Sandberg]

Hi,

The attahed patch changes all Music* types in the parser to SCM. I think I 
fixed some memory leaks also.

The next step in parser split-up is to move rules out to Scheme. There will be 
a lot of functions, so I suggest we create a new make-music.scm for this.

We will need a mechanism for handling music origins in a good way. I suggest 
that an optional parameter for origin is added to all make-*-music functions 
(or perhaps even automate this with a define-make-music-function macro)

In order to verify that I don't break stuff, I plan to do the following:
For each rule that will be moved out, I first create some .ly code that the 
rule is used for. Then I move the rule out to Scheme, and verify that 
\displayMusic still gives the same output.

The reson why I start with this before music streams are implemented, is that 
many rules need to be exported, so when patch reviewing lag comes in the way 
for continuing music stream work, I can use my time to export a couple of 
rules instead.

-- 
Erik

parser-scm.diff
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