Eat <*include*> at SOL to preserve semantics

 * Fixes the code that was already there to handle this case but just
   never matched.

 * Adds a test that fails html2wt because of nl normalization for
   heading and lists during serialization.

 * Fixes a blacklisted test (where we were storing incorrect output ...
   the template param shouldn't be fostered).

 * Ex. itwiki/Nati_nel_397?oldid=62551540

Bug: 66993
Change-Id: I9dc95079dcc8636bddbc7fb17d1a1bd19f208d17
Refactor include_limits

 * Removes the dummyText business.

Change-Id: Ia465575875b005db54255209e8c19b7b3afc7822