Merge branch 'master' into prepare-clang-format

# Conflicts:
#	src/KOKKOS/nbin_kokkos.h
#	src/KOKKOS/nbin_ssa_kokkos.h
#	src/MOLECULE/bond_fene_expand.h
#	src/USER-DPD/nbin_ssa.h
#	src/USER-DPD/nstencil_half_bin_2d_ssa.h
#	src/USER-DPD/nstencil_half_bin_3d_ssa.h
#	src/USER-INTEL/nbin_intel.h
#	src/USER-MISC/fix_propel_self.cpp
#	src/USER-OMP/npair_full_multi_old_omp.h
#	src/USER-OMP/npair_half_multi_old_newton_omp.h
#	src/USER-OMP/npair_half_size_multi_newtoff_omp.h
#	src/USER-OMP/npair_halffull_newtoff_omp.h
#	src/USER-OMP/npair_halffull_newton_omp.h
#	src/USER-OMP/npair_skip_omp.h
#	src/main.cpp
#	src/nbin_standard.h
#	src/npair_full_multi_old.h
#	src/npair_halffull_newtoff.h
#	src/npair_halffull_newton.h
#	src/npair_skip.h
#	src/npair_skip_respa.h
#	src/npair_skip_size.h
#	src/npair_skip_size_off2on.h
#	src/npair_skip_size_off2on_oneside.h
#	src/nstencil_full_bin_2d.h
#	src/nstencil_full_bin_3d.h
#	src/nstencil_full_ghost_bin_2d.h
#	src/nstencil_full_ghost_bin_3d.h
#	src/nstencil_full_multi_2d.h
#	src/nstencil_full_multi_3d.h
#	src/nstencil_full_multi_old_2d.h
#	src/nstencil_full_multi_old_3d.h
#	src/nstencil_half_bin_2d_newtoff.cpp
#	src/nstencil_half_bin_3d_newtoff.cpp
#	src/nstencil_half_bin_3d_newton_tri.h
#	src/nstencil_half_ghost_bin_2d_newtoff.cpp
#	src/nstencil_half_ghost_bin_2d_newtoff.h
#	src/nstencil_half_ghost_bin_3d_newtoff.cpp
#	src/nstencil_half_ghost_bin_3d_newtoff.h
#	src/nstencil_half_multi_2d.h
#	src/nstencil_half_multi_2d_newtoff.h
#	src/nstencil_half_multi_2d_newton_tri.h
#	src/nstencil_half_multi_2d_tri.h
#	src/nstencil_half_multi_3d_newtoff.h
#	src/nstencil_half_multi_3d_newton_tri.h

src/nstencil_half_multi_old_3d_tri.cpp

@@ -0,0 +1,53 @@
+// clang-format off
+/* ----------------------------------------------------------------------
+   LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
+   https://lammps.sandia.gov/, Sandia National Laboratories
+   Steve Plimpton, sjplimp@sandia.gov
+
+   Copyright (2003) Sandia Corporation.  Under the terms of Contract
+   DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
+   certain rights in this software.  This software is distributed under
+   the GNU General Public License.
+
+   See the README file in the top-level LAMMPS directory.
+------------------------------------------------------------------------- */
+
+#include "nstencil_half_multi_old_3d_tri.h"
+#include "atom.h"
+
+using namespace LAMMPS_NS;
+
+/* ---------------------------------------------------------------------- */
+
+NStencilHalfMultiOld3dTri::
+NStencilHalfMultiOld3dTri(LAMMPS *lmp) : NStencil(lmp) {}
+
+/* ----------------------------------------------------------------------
+   create stencil based on bin geometry and cutoff
+------------------------------------------------------------------------- */
+
+void NStencilHalfMultiOld3dTri::create()
+{
+  int i,j,k,n;
+  double rsq,typesq;
+  int *s;
+  double *distsq;
+
+  int ntypes = atom->ntypes;
+  for (int itype = 1; itype <= ntypes; itype++) {
+    typesq = cuttypesq[itype];
+    s = stencil_multi_old[itype];
+    distsq = distsq_multi_old[itype];
+    n = 0;
+    for (k = 0; k <= sz; k++)
+      for (j = -sy; j <= sy; j++)
+        for (i = -sx; i <= sx; i++) {
+          rsq = bin_distance(i,j,k);
+          if (rsq < typesq) {
+            distsq[n] = rsq;
+            s[n++] = k*mbiny*mbinx + j*mbinx + i;
+          }
+        }
+    nstencil_multi_old[itype] = n;
+  }
+}