The old ODF storage is style based and so the sam cond format can be
divided up into several single stlyes which resulted in several new
style cond formats.

Now we check for old stlye cond formats if there is a equal cond format
and in this case just extend the area. This should make it easier to
transform old documents into the new range based cond formats.

Change-Id: I51a5148922e19e6860de9915abfc59d49b18d96e