fix util:lists_split/2
fix util:lists_split/2

The remainder was returned as a separate, additional partition. Now it
is fairly distributed across the requested number of partitions.

scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris