Merge pull request #558 from lammps/intel

.github/PULL_REQUEST_TEMPLATE.md

doc/src/accelerate_intel.txt

doc/src/read_data.txt

examples/balance/in.balance.bond.fast

examples/balance/in.balance.bond.slow

src/USER-INTEL/fix_intel.cpp

src/USER-INTEL/intel_buffers.h

src/USER-INTEL/intel_preprocess.h

src/USER-INTEL/pppm_disp_intel.cpp

src/USER-INTEL/pppm_intel.cpp

src/USER-INTEL/pppm_intel.h