LOGNORMDIST function can return also non-cumulative values

see similar GAMMADIST, FDIST and other functions

Change-Id: I6c9d9e3281cc6631637e2d8449488dc574c2e1e8
Reviewed-on: https://gerrit.libreoffice.org/7538
Reviewed-by: Andras Timar <andras.timar@collabora.com>
Tested-by: Andras Timar <andras.timar@collabora.com>