(font-lock-verbose): Default to 0. Doc fix.

(font-lock-verbose): Default to 0.  Doc fix.
(font-lock-default-fontify-buffer): Interpret numeric value.
(font-lock-fontified): Don't make it permanent-local.
(font-lock-mode): Remove before-revert-hook and after-revert-hook code.
Call font-lock-turn-on-thing-lock before font-lock-mode-hook.  Doc fix.
(font-lock-revert-setup, font-lock-revert-cleanup): Deleted.
(font-lock-support-mode): New variable.
(font-lock-turn-on-thing-lock): New function.  Use it.
(font-lock-turn-off-thing-lock): Renamed font-lock-thing-lock-cleanup.
(font-lock-change-major-mode): Turn off Font Lock mode if it is on.
Add font-lock-change-major-mode to change-major-mode-hook at top level.