Refactor Dump and Irregular classes to remove static class members

-DLMP_USE_LIBC_QSORT will use qsort() from libc to sort (requires static/global variables).
-DLMP_USE_MERGE_SORT will use a plain merge sort. slightly slower for expensive comparisons.
-DLMP_USE_HYBRID_SORT will use hybrid merge sort. faster than merge sort (no static/global variables)

recover running USER-DPD with USER-OMP and suffixes

- use insertion sort to pre-sort data in 32-element chunks
- swap pointers between merge runs instead of copying the data

Refactor ring communication to no longer require static class variables

Bugfix in AIREBO as reported in #59 by @KammIma

Collected small changes

This reverts commit 06612300.

Affiliation Update for USER-CGDNA

Added compute_scalar to fix_grem

Implemented pair style vashishta in GPU package

Refactoring of USER-TALLY computes to handle sparse/hybrid system for many processors plus bugfixes

Refactor and bugfix for some TIP4P pair styles

Updated NetCDF dump style (dump netcdf)

Kokkos library update to v2.03.05

Some extensions/cleanup in USER-MANIFOLD

Add `reinit` keyword to rigid body fixes

Implement check whether commands or styles try to change cached properties in rigid body integrators

Remove unnecessary thread fences in Kokkos package

Integrate compute cnp/atom contributed by Paulo Branicio (USC)

add "atomonly" optimized neighbor list build styles to USER-OMP

Using correct ndegree instead of nnn

Add USER-OMP compatible OpenMP support to USER-REAXC

added several features to the NEB

The dump and irregular classes were using qsort() from the C-library
for sorting lists through custom comparison functions, which required
access to additional data, which was passed via static class variables,
i.e. globals. This collides with having multiple LAMMPS instances in
the same address space.

the calls to qsort() are replaced with a custom merge sort, which passes
a void pointer to the comparison functions, which can contain any kind
of desired information, e.g. a class handle or a list

change ring communication API to no longer require a static variable pointing to 'this' of the caller