Disable the positioning for objects that are completely off-page.
During import, LO writer forces content always back to the page
and causes unwanted content on the page in constrast to MSO.

To achive this the top/left position of the content is compared to the bottom/right border of the clipping region.

A new compatibility flag OFF_PAGE_POSITIONING is introduced for
legacy rendering of legacy documents.

A unit test demonstrates the issue.

It resolves tdf#112443.

Change-Id: I263c129f9f09ed909ad777a34f8b9ffc84d871e4
Reviewed-on: https://gerrit.libreoffice.org/43313Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>