handle docx's w:anchor layoutInCell attribute (bnc#891663)

(cherry picked from commit 3891ba42a886fa85eb43da24d1badf44e765d54c)

Conflicts:
	sw/qa/extras/ooxmlimport/ooxmlimport.cxx
	writerfilter/source/dmapper/PropertyIds.cxx
	writerfilter/source/dmapper/PropertyIds.hxx

Change-Id: I8268567b84aa0f6e42624bfd0f79c8c49c153edd
Reviewed-on: https://gerrit.libreoffice.org/11569
Reviewed-by: Andras Timar <andras.timar@collabora.com>
Tested-by: Andras Timar <andras.timar@collabora.com>