Merge pull request #511 from akohlmey/add-compute-cnp

doc/src/Eqs/cnp_cutoff.jpg

doc/src/Eqs/cnp_cutoff.tex

doc/src/Eqs/cnp_cutoff2.jpg

doc/src/Eqs/cnp_cutoff2.tex

doc/src/Eqs/cnp_eq.jpg

doc/src/Eqs/cnp_eq.tex

doc/src/Section_commands.txt

doc/src/compute_cna_atom.txt

doc/src/compute_cnp_atom.txt

doc/src/computes.txt

doc/src/lammps.book

examples/USER/misc/cnp/Cu_Mishin1.eam

examples/USER/misc/cnp/in.cnp

examples/USER/misc/cnp/log.31May17.cnp.g++.4

src/.gitignore

src/USER-MISC/README

src/USER-MISC/compute_cnp_atom.cpp

src/USER-MISC/compute_cnp_atom.h