DatabaseRange has got the property TotalsRow with UI and UNO. But this
property was not written to ODF. The patch adds this as attribute
calcext:contains-footer to <table:database-range> element.
Related is issue OFFICE-4169 at OASIS.
Change-Id: I99a51198585b9b7dfb840217bdf1312f2462c9bc
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/173612
Tested-by: Jenkins
Reviewed-by: Regina Henschel <rb.henschel@t-online.de>
