* allout.el (allout-regexp, allout-line-boundary-regexp)

* allout.el (allout-regexp, allout-line-boundary-regexp)
	(allout-bob-regexp): Correct grouping and boundaries to fix
	backwards traversal.
	(allout-depth-specific-regexp, allout-depth-one-regexp): New
	versions that exploit \\{M\\} regexp syntax, to avoid geometric or
	worse time in allout-ascend.
	(allout-doublecheck-at-and-shallower): Identify depth threshold
	below which topics are checked for and disqualified by containment
	discontinuities.
	(allout-hotspot-key-handler): Correctly handle multiple-key
	strokes.  Remove some unused variables.
	(allout-mode-leaders): Clarify that mode-specific comment-start
	will be used
	(set-allout-regexp): Correctly regexp-quote allout regexps to
	properly accept alternative header-leads and primary bullets with
	regexp-specific characters (eg, C "/*", mathematica "(*").
	Include new regular expressions among those configured.
	(allout-infer-header-lead-and-primary-bullet): Rename
	allout-infer-header-lead.
	(allout-recent-depth): Manifest as a variable as well as a function.
	(allout-prefix-data): Simplify into an inline instead of a macro,
	assuming current match data rather than being explicitly passed it.
	Establish allout-recent-depth value as well as
	allout-recent-prefix-beginning and allout-recent-prefix-end.
	(allout-aberrant-container-p): True when an item's immediate
	offspring discontinuously contained.  Useful for disqualifying
	unintended topic prefixes, likely at low depths.
	(allout-goto-prefix-doublechecked): Elaborated version of
	allout-goto-prefix which disqualifies aberrant pseudo-items.
	(allout-end-of-prefix, allout-pre-next-prefix)
	(allout-end-of-subtree): Disqualify aberrant containers.
	(allout-beginning-of-current-entry): Position at start of buffer
	when in container (depth 0) entry.
	(nullify-allout-prefix-data): Invalidate allout-recent-* prefix data.
	(allout-current-bullet): Strip text properties.
	(allout-get-prefix-bullet): Use right match groups.
	(allout-beginning-of-line, allout-next-heading): Disqualify
	aberrant containers.
	(allout-previous-heading): Disqualify aberrant containers.
	(allout-get-invisibility-overlay): Increment so progress is made
	when the first overlay is not the sought one.
	(allout-end-of-prefix): Disqualify aberrant containers.
	(allout-end-of-line): Cycle something like allout-beginning-of-line.
	(allout-mode): Make allout-old-style-prefixes (ie, enabling use with
	outline.el outlines) functional again.  Change the primary bullet
	along with the header-lead - level 1 new-style bullets now work.
	Engage allout-before-change-handler in mainline emacs, not just
	xemacs, to do undo handling.
	(allout-before-change-handler): Expose undo changes occurring in
	hidden regions.  Use allout-get-invisibility-overlay instead of
	reimplementing it inline.
	(allout-chart-subtree): Use start rather than end of prefix in
	charts.  Use allout-recent-depth variable.
	(allout-chart-siblings): Disqualify aberrant topics.
	(allout-beginning-of-current-entry): Position correctly.
	(allout-ascend): Use new allout-depth-specific-regexp and
	allout-depth-one-regexp for linear instead of O(N^2) or worse behavior.
	(allout-ascend-to-depth, allout-up-current-level): Depend on
	allout-ascend, rather than reimplementing an algorithm.
	(allout-descend-to-depth): Use allout-recent-depth var instead of fun.
	(allout-next-sibling): On traversal of numerous intervening
	topics, resort to economical allout-next-sibling-leap.
	(allout-next-sibling-leap): Specialized version of
	allout-next-sibling that uses allout-ascend cleverly, to depend on
	a regexp search to leap large numbers of contained topics, rather
	than arbitrarily many one-by-one traversals.
	(allout-next-visible-heading): Disqualify aberrant topics.
	(allout-previous-visible-heading): Position consistently when interactive.
	(allout-forward-current-level): Base on allout-previous-sibling
	rather than reimplmenting the algorithm.  Remove unused vars.
	(allout-solicit-alternate-bullet): Present default choice stripped
	of text properties.
	(allout-rebullet-heading): Use bullet stripped of text properties.
	Register changes using allout-exposure-change-hook.  Disregard
	aberrant topics.
	(allout-shift-in): With universal-argument, make topic a peer of
	it's former offspring.  Simplify the code by separating out
	allout-shift-out functionality.
	(allout-shift-out): With universal-argument, make offspring peers
	of their former container, and its siblings.  Implement the
	functionality here, rather than inappropriately muddling the
	implementation of allout-shift-in.
	(allout-rebullet-topic): Respect additional argument for new
	parent-child separation function.
	(allout-yank-processing): Use allout-ascend directly.
	(allout-show-entry): Disqualify aberrant topics.
	(allout-show-children): Handle discontinuous children gracefully,
	extending the depth being revealed to expose them and posting a
	message indicating the situation.
	(allout-show-to-offshoot): Remove obsolete and incorrect comment.
	Leave cursor in correct position.
	(allout-hide-current-subtree): Use allout-ascend directly.
	Disqualify aberrant topics.
	(allout-kill-line, allout-kill-topic): Preserve exposure layout in
	a way that the yanks can restore it, as used to happen.
	(allout-yank-processing): Restore exposure layout as recorded by
	allout-kill-*, as used to happen.
	(allout-annotate-hidden, allout-hide-by-annotation): New routines
	for preseving and restoring exposure layout across kills.
	(allout-toggle-subtree-encryption): Run allout-exposure-change-hook.
	(allout-encrypt-string): Strip text properties.
	Rearranged order and outline-headings for some of the
	miscellaneous functions.
	(allout-resolve-xref): No need to quote the error name in the
	condition-case handler section.
	(allout-flatten): Classic recursive (and recursively intensive,
	without tail-recursion) list-flattener, needed by allout-shift-out
	when confronted with discontinuous children.