* lisp/minibuffer.el: New file.

* lisp/minibuffer.el: New file.
* src/minibuf.c (last_exact_completion): Remove variable.
(Fdelete_minibuffer_contents, do_completion, Fminibuffer_complete)
(complete_and_exit_1, complete_and_exit_2)
(Fminibuffer_complete_and_exit, Fminibuffer_complete_word)
(Fdisplay_completion_list, display_completion_list_1)
(Fminibuffer_completion_help, Fself_insert_and_exit)
(Fexit_minibuffer, Fminibuffer_message): Move functions to minibuffer.el.
(syms_of_minibuf): Remove corresponding initializations.