* lisp/emacs-lisp/macroexp.el (macroexpand-all-1):
Support compiler-macros directly. Properly follow aliases and apply
the compiler macros more thoroughly.
* lisp/emacs-lisp/cl.el: Don't copy compiler-macro properties any more since
macroexpand now properly follows aliases.
* lisp/emacs-lisp/cl-macs.el (toplevel, cl-define-compiler-macro)
(cl-compiler-macroexpand): Use new prop.
* lisp/emacs-lisp/byte-opt.el (featurep): Optimize earlier.
* lisp/emacs-lisp/cl-lib.el (custom-print-functions): Add compatibility alias.
* lisp/emacs-lisp/cl.el: New compatibility file.
* emacs-lisp/cl-lib.el, lisp/emacs-lisp/cl-seq.el, lisp/emacs-lisp/cl-macs.el:
* lisp/emacs-lisp/cl-extra.el: Rename all top-level functions and variables
to obey the "cl-" prefix.
* lisp/emacs-lisp/macroexp.el (macroexpand-all-1): Adjust to new name.
