Alexander

> 2. Remove `src/p3m/` and put `P3MParticleContainer` together with the high level P3M manager(s) into a `alpine/p3m/...` folder. _Update after todays IPPL Meeting_: Let's not extend "alpine", but rather create...

The P3M code looks good to me, I'll also try to run it in a second. - I would add a short description to new classes (just an explanation of...

@matt-frey I requested your review so that you can take a look at the ``ParticleAttrib::internalCopy` function, since you mostly wrote the class, correct? The function works perfectly fine in my...

**Update**: I created a test file (`test/particle/TestSorting.cpp`) that initializes random charge values $0.5 \leq q \leq 10.5$, sorts an index array (of type `ippl::hash_type`) with `bunch.q` being the key and...