In https://mmg-gitlab.fjfi.cvut.cz/gitlab/tnl/tnl-dev/commit/30b25f639627af6c9b5055a901a5fc599e2b46b2, the `multiplicator` parameter was added to the `vectorProduct` method in the Ellpack format to be able to compute `outVector = multiplicator * matrix * inVector` in one step. The parameter should be added to other sparse matrix formats as well.