1.4.0 Release Candidate

[haykh]

TODO

• Custom weight distribution Custom weight distribution  #155
• Load balancing Dynamic domain decomposition #151
• [BUG] GRPIC enery mometum tensor output is not calculated correctly #173
• [BUG] mass is not accounted in computation of bulk flow velocity #170

New features

• Single particle QED emission #174

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
• plog and toml11 headers are now explicitly in the include directory and are fixed fc13991.
• 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.
• srpic.hpp is now subdivided into different dedicated header files with explicit functions.
• Pusher_kernel now accepts an additional template argument: class E = NoEmissionPolicy_t<SimEngine::SRPIC, M>.

Bug fixes

• [BUG] Memory allocation error from Kokkos random number generator #132 (fixed in v1.3.3)
• [BUG] Restart fails when reading integer time variable #169
• fixed issue of writing checkpoint with non-zero n_pld_r #175
• FIXED boundaries for fields now properly transform the passed field components from tetrad basis to code units (per 1d34ab9)
• v1.3 GRPIC vacuum solution is unstable at high resolutions -- GRPIC now uses "no gradient" conditions for Dr on the axes inside the Ampere kernel

Minor changes

• bumped all dependency version (incl. Kokkos to 5.0.0, and ADIOS2 to 2.11.0)
• support for 2D arrays in input file (per e207373)
• -D TESTS=ON can now be used together with pgen to also compile all unit tests.
• GRPIC now compiles when no init_flds is present in pgen (per f13a68d)
• stdc++fs now only links with non-AppleClang compilers, since on Apple Clang it's linked by default, and will raise an error if linked explicitly.

[haykh]

@alisagk could you add a comment in the main message on changes to GR axes bcs?