Merge branch 'new_time_line' into 'master'
Improve readability of active/inactive condition This, as is, is rather minor but it's on the way towards improving the time-stepping. I have replaced all explicit checks that a particle or cell is active by calls to inlined functions. No change in functionality thus far. The plan is to slowly introduce a better time-stepping mechanism where the particles carry less information (lower footprint) and make the whole time-step limiter problem easier. With this merge request in then I only need to make the changes in one single location (file active.h) and not everywhere. See merge request !279