fdo#72197 Add Excel 2010 functions

MODE.SNGL, MODE.MULT, NEGBINOM.DIST, Z.TEST

Change-Id: I55eb05e1ebdb9dbc3ce9ae84e3cdacfdfa112091
Reviewed-on: https://gerrit.libreoffice.org/7776
Tested-by: LibreOffice gerrit bot <gerrit@libreoffice.org>
Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Eike Rathke <erack@redhat.com>