Star density
The star density is implemented !581 (merged), but a few things are still missing:
- 
recurse and split tasks  - 
MPI  - 
cell_is_active - 
Task action for two type of part  - 
drift_spart and not gpart  
Edited  by Loic Hausammann
The star density is implemented !581 (merged), but a few things are still missing:
cell_is_active