<ins>/<del> elements can be phrasing or flow

<ins>/<del> elements can be phrasing or flow

The changes to the parserTests.txt highlight the differing opinions that
doBlockLevels and Remex had on whether these should be paragraph wrapped.

Since the only time they wouldn't have been was when found on a line
with other flow tags, this likely isn't a behaviour that was depended on
in practice.  And, indeed, the task describes this as a bug.

A sampling of pages from an insource:/\<(ins|del)\>/ search on wiki bears
this out.

Bug: T17491
Change-Id: I311da777a63aa3c45013f2cfc090be35a022497e