Add missing entries to the browser based test harness
Ensure PositionIterator.setUnfilteredPosition has round-trip stability

Calling setUnfilteredPosition with a result previously obtained from the
iterator should effectively resume iteration at exactly this position.
As added tests demonstrated, specifying a node with no children and an
offset of 0 was incorrectly causing currentPos to be restored to the value
of 0. This meant calls to iterator.container() would return the a different
value.
SelectionMover.countStepsToPosition will always round both the cursor and target to previous accepted position

Previous implementation would result in some unexpected behaviours when
both the cursor and the requested position were in locations not considered
valid by the supplied filter. This would cause the number of steps between
these to fluctuate unexpectedly by 1.

This change fixed the local user cursor advancement logic (odtDocument, ln 359)
so that the current user's cursor will now acurrately report it's position.
For the modified operation test, previously getCursorPosition was returning
one too many (6 rather than 5), preventing the cursor migration logic from
activating.