add module-{define-keyword!,undefine-keyword!,lookup-keyword}

add module-{define-keyword!,undefine-keyword!,lookup-keyword}

* libguile/modules.c (scm_module_local_variable): Allow this to be called
  before modules are booted with #f as the module.

* module/ice-9/boot-9.scm (module-define-keyword!)
  (module-lookup-keyword, module-undefine-keyword!): Well, if syncase
  forces us to allow the keyword bindings to be partitioned from value
  bindings, let's go ahead and do that in boot-9 instead of in
  psyntax. A step on the way to removing `install-global-transformer'.
  (sc-chi): Remove.

* module/ice-9/psyntax.scm (put-global-definition-hook):
  (remove-global-definition-hook, get-global-definition-hook): Use our
  new module-* functions.
  (sc-chi): Remove, no longer needed.

* module/ice-9/psyntax-pp.scm: Regenerated.