Added test case to test flexibility.
Updated old test case 443678, which is better with this fix.
This fixes#523 and tries to be as general as possible. Right now the fix is
only applied if the prev or next tag is a body level div, but perhaps should
be applied for anything that's acting as block level element. In any case,
the specific bug is killed.
Naked groups of LI in HTML5 mode will now have an inferred UL applied to
them consistent with HTML4 and earlier modes.
Test case added.
Note that three regressions were updated in favor of this corrected behavior.
Jim Derry