2006-09-29  Ken Manheimer  <address@hidden>

	(allout-current-depth): Do aberrent check only at or below
	doublecheck depth.
	(allout-chart-subtree): Make it explicit that LEVELS being nil
	means unlimited depth.  Drop undocumented support for LEVELS value
	t meaning unlimited depth.  (This is consistent with
	allout-chart-to-reveal, but contrary to allout-show-children,
	which needs to use nil to default to depth of 1.)
	(allout-goto-prefix-doublechecked): Wrap long docstring line.
	(allout-chart-to-reveal): Be explicit in docstring about meaning
	of nil LEVELS, and drop support for LEVELS value t.
	(allout-show-children): Translate the level spec used by this
	routine to that used by allout-chart-subtree and
	allout-chart-to-reveal.
	(allout-show-to-offshoot): Retry once when stuck, after opening
	subtree - improvements in discontinuity handling likely will
	enable progress.
	(allout-expose-topic): Rectify implementation of "+" spec, so that
	the subtrees are hidden and only the headlines are exposed.
	(Thanks to bill white for contributing this fix.)