Fixed missing dependency between init and density in the case of sub-tasks.

Not sure whether these dependencies disappeared at some stage or whether they have never been there but they are clearly missing.

That fixes #153 (closed) and potentially the MPI issues if they are due to missing links. Can't really test it from here. @pdraper that might be of interest to you.

Good catch :)

Reassigned to @pdraper

Sadly hasn't helped the MPI issues, so the search continues.

Clearly correct, so accepting.

mentioned in commit f97e8c3d

Status changed to merged

My secret hope to magically solve the MPI issue is once again unsatisfied... :(