PERCENTILE.EXC, PERCENTILE.INC
PERCENTRANK.EXC, PERCENTRANK.INC
QUARTILE.EXC, QUARTILE.INC
RANK.EQ, RANK.AVG

Function ScInterpreter::ScRank() has been rewritten to give the function
the same way of computing as the related functions in this patch.

Change-Id: If3096b265bd47ca5f4afcab7ff746f7c8511df82
Reviewed-on: https://gerrit.libreoffice.org/7319Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Eike Rathke <erack@redhat.com>