(read_minibuf): Use empty_string.
(Ftry_completion): Allow lambda forms and lists of strings for `alist'. Short-circuit the search as soon as it "failed". (Fall_completions): Allow lambda forms and lists of strings for alist. (Fcompleting_read): Set Qminibuffer_completion_confirm to nil when require_match is nil. (Ftest_completion): Rename from `test_completion' and export to elisp. Call the predicate also when alist is a list. Obey Vcompletion_regexp_list. (do_completion, Fminibuffer_complete_and_exit): Use it. (Fassoc_string): Rename from `assoc_for_completion'. Allow list of strings as well and export to elisp.
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