We attempted to have 8884 VirtualDevices in parallel. This number is now
12 after fixing the leaks.

The original bugdoc has 135 images, 76 is enough to make Writer on
Windows crash. The minimized document has the same WMF data for all the
images, but still duplicated inside the ZIP container, so we trigger the
resource limit, but the document is still just 99K.

Change-Id: I4c6b3853eaf688302323daf67ff7b62dd64fc412