Support array argument for values.
At least one value must be positive and at least one value must be
negative.
Text and empty cells in the value range are ignored.

Change-Id: I1c086767bd4cf997be40f5f58fde75a639acb132
Reviewed-on: https://gerrit.libreoffice.org/27036Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Eike Rathke <erack@redhat.com>