Fix fdo#80451: New DIST functions from Excel

EXPON.DIST, HYPGEOM.DIST, POISSON.DIST and WEIBULL.DIST

Change-Id: I10ca3013e430c53a03d4795d0c47cbaaeb7b9adb
Reviewed-on: https://gerrit.libreoffice.org/10423
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>