write valid dxf record, related fdo#71971

Change-Id: I99f4dfca78cc0fd5d9b947000a99f8414c2a899b
more OOXML export validation fixes, fdo#71971

Change-Id: Ic322d58817986887bbcd666ac3abc416609adf5c
make the validation tool happy

This is just fucking awesome. The MSO implementers notes mention this
attribute and point to some extended information that is either missing
or does not mention this attribute. To make it more funny the MSO
validation complains about invalid values in this attribute for our
export.

Change-Id: Iacf1a6666f9f6124106952ae19ae5d5866bc8cf1