Merge pull request #669 from urpedersen/master

doc/src/Eqs/fix_rhok.jpg

doc/src/Eqs/fix_rhok.tex

doc/src/Section_commands.txt

doc/src/fix_rhok.txt

doc/src/fixes.txt

doc/src/lammps.book

examples/USER/misc/pinning/README.md

examples/USER/misc/pinning/in.crystal

examples/USER/misc/pinning/in.pinning

examples/USER/misc/pinning/in.setup

examples/USER/misc/pinning/log.22Sep2017.crystal.g++.1

examples/USER/misc/pinning/log.22Sep2017.crystal.g++.4

examples/USER/misc/pinning/log.22Sep2017.pinning.g++.1

examples/USER/misc/pinning/log.22Sep2017.pinning.g++.4

examples/USER/misc/pinning/log.22Sep2017.setup.g++.1

examples/USER/misc/pinning/log.22Sep2017.setup.g++.4

src/.gitignore

src/USER-MISC/README

src/USER-MISC/fix_rhok.cpp

src/USER-MISC/fix_rhok.h