1.4.0 Release Candidate

[haykh]

New features

• Custom weight distribution Custom weight distribution  #155
• Load balancing Dynamic domain decomposition #151
• Single particle emission

Breaking changes

• C++20 is the new standard, CMake 3.5+ is now required (per 98669a2)

API changes

• [radiation] added to input substituting the previous [algorithms.synchrotron] etc.
• [species.cooling] is now [species.radiative_drag].
• traits::compatible_with in PGen is now arch::traits::pgen::compatible_with, imported from a header #include "archetypes/traits.h". All default pgens have been changed.

Architectural changes

• C++20 concept-s and requires-clauses replace the sfinae tests C++20 Concepts #161
• Parameter reading is fully modularized.
• Cooling changed to RadiativeDrag; now accepts multiple entries.
• PrtlPusher similarly changed to ParticlePusher; now accepts composition of different values.
• Contstructor for kernel::sr::Pusher_kernel is now cleaner accepting two auxiliary classes: PusherParams & PusherArrays.
• module-specific traits are now collected in corresponding traits.h files.
• additional unit tests added for the problem generator traits.

Bug fixes

• Memory errors from Kokkos number generator [BUG] Memory allocation error from Kokkos random number generator #132
• [BUG] Restart fails when reading integer time variable #169
• fixed issue of writing checkpoint with non-zero n_pld_r #175

Minor changes

• bumped all dependency version (incl. Kokkos to 5.0.0, and ADIOS2 to 2.11.0)