(hi-lock-mode): Toggling hi-lock-mode now affects all

(hi-lock-mode): Toggling hi-lock-mode now affects all
buffers.  When hi-lock turned on rather than only checking current
buffer for regexps, all buffers are checked. Moved activation of
font-lock to hi-lock-refontify. When font-lock turned off rather
than removing added highlighting just in current buffer, remove it
in all buffers.  Changed edit menu text from "Automatic
Highlighting" to "Regexp Highlighting" Documentation for
highlighting phrases, minor documentation changes.
(hi-lock-set-file-patterns): Execute only if there are new or
existing file patterns.
(hi-lock-refontify): Assume font-lock-fontify-buffer will first
unfontify and, if a support mode is active, will not refontify the
whole buffer.  If necessary, turn on font lock. (Removed
font-lock-unfontify and font-lock support-mode-specific calls,
such as lazy-lock-fontify-window.)
(hi-lock-find-patterns): Do not turn on hi-lock-mode even if
patterns are found. Not useful now since find-file-hook is removed
if hi-lock is off, but may be needed for per-buffer hi-lock
activation.
(hi-lock-face-phrase-buffer): New function.  Also added related
menu item and keybinding.
(highlight-phrase): New alias, to hi-lock-face-phrase-buffer.
(hi-lock-process-phrase): New function.
(hi-lock-line-face-buffer): Doc fixes.
(hi-lock-face-buffer): Doc fixes.
(hi-lock-unface-buffer): Doc fixes.