fdo#40788: Allow manual breaks in Calc to be forced

If the scale settings specify that the print ranges must be scaled
across a specific number of pages, the default behaviour is to ignore
breaks to avoid the case where breaks force more pages than specified.
Here, an option under Calc -> Print -> Pages is added so that the user
can specify that manual row and column breaks should be forced.

Change-Id: I445cd7ce9e16e4ec2d0c320f059edad62b40f22d
Reviewed-on: https://gerrit.libreoffice.org/6531
Tested-by: Eike Rathke <erack@redhat.com>
Reviewed-by: Eike Rathke <erack@redhat.com>