sd:merge-pagenumber() - implement range
Better error message on missing x-grid setting
Bugfix: misplaced white background

When cutmarks="yes", the white background that is
inserted on every page is now properly aligned.
Re-generate qa master-pdfs

The previous commit changes the output of the PDFs,
therefore all comparisons fail.
New dynamic table headers

Table rows (Tr) can be propagated as future table headers
Resolve ranges with sd:merge-pagenumbers()