Merge branch 'master' into doc-updates

doc/src/Eqs/pair_agni.jpg

doc/src/Eqs/pair_tersoff_mod_c.jpg

doc/src/Eqs/pair_tersoff_mod_c.tex

doc/src/Eqs/pressure.jpg

doc/src/Eqs/pressure.tex

doc/src/Eqs/pressure_tensor.jpg

doc/src/Eqs/pressure_tensor.tex

doc/src/Manual.txt

doc/src/Section_commands.txt

doc/src/compute_pressure.txt

doc/src/lammps.book

doc/src/pair_agni.txt

doc/src/pair_tersoff_mod.txt

doc/src/pair_vashishta.txt

doc/src/pairs.txt

examples/USER/misc/agni/Al_prb.agni

examples/USER/misc/agni/adatom.data

examples/USER/misc/agni/in.adatom

examples/USER/misc/agni/in.vacancy

examples/USER/misc/agni/log.9Nov16.adatom.g++.1