deprecate save-stack, stack-saved?

deprecate save-stack, stack-saved?

* module/Makefile.am:
* module/ice-9/boot-9.scm:
* module/ice-9/save-stack.scm (stack-saved?, save-stack): Move these
  bindings to their own module.

* module/oop/goops.scm (goops-error):
* module/ice-9/boot-9.scm (error, top-repl): Remove calls to save-stack.

* module/ice-9/deprecated.scm (stack-saved?, save-stack): Add deprecated
  shims.

* module/ice-9/emacs.scm:
* module/ice-9/stack-catch.scm:
* module/ice-9/debugger/command-loop.scm:
* module/ice-9/scm-style-repl.scm: Import (ice-9 save-stack).