* files.el (safe-local-variable-values): New option.

* files.el (safe-local-variable-values): New option.
	(hack-local-variables-prop-line): Return a list of variable-value
	pairs if MODE-ONLY is non-nil.
	(hack-local-variables): Construct list of variable-value pairs,
	and apply or reject them in one go.  Ask for confirmation if
	variables are not known safe.
	(hack-local-variables-confirm): Complete rewrite.  Support
	`safe-local-variable-values'.
	(enable-local-variables): Update docstring to reflect new
	behavior.
	(ignored-local-variables): Ignore ignored-local-variables and
	safe-local-variable-values.
	(safe-local-variable-p): New function.
	(risky-local-variable-p): `safe-local-variable' property check
	moved to safe-local-variable-p.
	(hack-one-local-variable): Checks moved to hack-local-variables.

	(byte-compile-dynamic, c-basic-offset, c-file-style,
	c-indent-level, comment-column, fill-column, fill-prefix,
	indent-tabs-mode, kept-new-versions, no-byte-compile,
	no-update-autoloads, outline-regexp, page-delimiter,
	paragraph-start, paragraph-separate, sentence-end,
	sentence-end-double-space tab-width, version-control): Add
	`safe-local-variable' property.

	* find-lisp.el: Delete nonexistent `autocompile' file variable.

	* icomplete.el, play/landmark.el: Change nonexistent
	`outline-layout' file variable to `allout-layout'.