Merge branch 'master' into kk_update

doc/src/Section_commands.txt

doc/src/compute_dihedral_local.txt

doc/src/create_atoms.txt

doc/src/create_bonds.txt

doc/src/fix_rigid.txt

doc/src/lammps.book

doc/src/pair_extep.txt

doc/src/pair_yukawa.txt

doc/src/pairs.txt

doc/src/print.txt

doc/src/replicate.txt

examples/USER/misc/extep/BN.data

examples/USER/misc/extep/in.extep-bn

examples/USER/misc/extep/log.23Oct17.extep-bn.g++.1

examples/USER/misc/extep/log.23Oct17.extep-bn.g++.4

examples/gcmc/in.gcmc.co2

examples/gcmc/in.gcmc.h2o

examples/gcmc/in.gcmc.lj

examples/gcmc/log.23Oct17.gcmc.co2.g++.1

examples/gcmc/log.23Oct17.gcmc.co2.g++.4