COS cleanup

[Doug Evans]

fyi, I checked this in.

I still have to convert all the other class definitions over
to using the new macros.

2010-01-24  Doug Evans  <dje@sebabeach.org>

	* utils-cgen.scm (<location>): Define using new define-class.
	(<ident>, <source-ident>, <context>): Ditto.

	* cos.scm (/object-string): New function.
	(/object-error): Use it.
	(/object-count-true): New function
	(object-copy-top): Delete.  All callers changed to call object-copy.
	(/parse-member-list, /build-getter-defs, /build-setter-defs): New fns.
	(define-class, define-interface, define-method): New macros.
	(define-getters, define-setters, vmake): Moved here ...
	* utils-cgen.scm: ... from here.