Merge branch 'master' into less-compiler-warnings

cmake/CMakeLists.txt

cmake/FindLAMMPS.cmake.in

cmake/Modules/FindZMQ.cmake

cmake/pkgconfig/liblammps.pc.in

doc/src/Build_extras.txt

doc/src/Build_package.txt

doc/src/Commands_all.txt

doc/src/Howto.txt

doc/src/Howto_client_server.txt

doc/src/Howto_couple.txt

doc/src/Manual.txt

doc/src/Packages_details.txt

doc/src/Packages_standard.txt

doc/src/Run_options.txt

doc/src/commands_list.txt

doc/src/fix_client_md.txt

doc/src/lammps.book

doc/src/message.txt

doc/src/server.txt

doc/src/server_mc.txt