we need to copy the condition format cell for cell, fdo#86253

Change-Id: Ic090e1b9d13780e7e895a85901d3329cc5703688
don't call XLSX methods in XLS export, related fdo#59762

This should fix a huge number of our xls export crashes. I just picked
my test document for the commit message. I suppose that nearly all
reported XLS export crashes are the same issue.

At the same time this should improve the performance of our XLS and XLSX
export a bit.

Change-Id: Id19e2515e75e10527d3af62d671377bec23f99e8