Makefile build support for USER-ADIOS and build documentation

doc/src/Build_extras.txt

@@ -37,6 +37,7 @@ This is the list of packages that may require additional steps.
 "POEMS"_#poems,
 "PYTHON"_#python,
 "VORONOI"_#voronoi,
+"USER-ADIOS"_#user-adios,
 "USER-ATC"_#user-atc,
 "USER-AWPMD"_#user-awpmd,
 "USER-COLVARS"_#user-colvars,
@@ -576,6 +577,28 @@ the lib/voronoi/Makefile.lammps file.
 
 :line
 
+USER-ADIOS package :h4,link(user-adios)
+
+The USER-ADIOS package requires the "ADIOS I/O library"_https://github.com/ornladios/ADIOS2, version 2.3.1 or newer.
+Make sure that you have ADIOS built with/without MPI if you build LAMMPS with/without MPI, respectively.
+
+[CMake build]:
+
+-D ADIOS2_DIR=path        # path is where ADIOS 2.x is installed
+-D PKG_USER-ADIOS=yes     :pre
+
+[Traditional make]:
+
+Turn on the USER-ADIOS package before building LAMMPS. If the ADIOS 2.x software is installed in PATH, there is nothing else to do:
+
+make yes-user-adios                       :pre
+
+otherwise, set ADIOS2_DIR environment variable when turning on the package:
+
+ADIOS2_DIR=path make yes-user-adios   # path is where ADIOS 2.x is installed :pre
+
+:line
+
 USER-ATC package :h4,link(user-atc)
 
 The USER-ATC package requires the MANYBODY package also be installed.

doc/src/Build_package.txt

@@ -48,6 +48,7 @@ packages:
 "POEMS"_Build_extras.html#poems,
 "PYTHON"_Build_extras.html#python,
 "VORONOI"_Build_extras.html#voronoi,
+"USER-ADIOS"_Build_extras.html#user-adios,
 "USER-ATC"_Build_extras.html#user-atc,
 "USER-AWPMD"_Build_extras.html#user-awpmd,
 "USER-COLVARS"_Build_extras.html#user-colvars,

doc/src/Packages_details.txt

@@ -63,6 +63,7 @@ as contained in the file name.
 "SRD"_#PKG-SRD,
 "VORONOI"_#PKG-VORONOI :tb(c=6,ea=c)
 
+"USER-ADIOS"_#PKG-USER-ADIOS,
 "USER-ATC"_#PKG-USER-ATC,
 "USER-AWPMD"_#PKG-USER-AWPMD,
 "USER-BOCS"_#PKG-USER-BOCS,
@@ -975,6 +976,31 @@ examples/voronoi :ul
 
 :line
 
+USER-ADIOS package :link(PKG-USER-ADIOS),h4
+
+[Contents:]
+
+ADIOS is a high-performance I/O library. This package implements the 
+dump "atom/adios" and dump "custom/adios" commands to write data using
+the ADIOS library. 
+
+[Authors:] Norbert Podhorszki (ORNL) from the ADIOS developer team.
+
+[Install:]
+
+This package has "specific installation
+instructions"_Build_extras.html#user-adios on the "Build
+extras"_Build_extras.html doc page.
+
+[Supporting info:]
+
+src/USER-ADIOS: filenames -> commands
+src/USER-ADIOS/README
+examples/USER/adios
+https://github.com/ornladios/ADIOS2 :ul
+
+:line
+
 USER-ATC package :link(PKG-USER-ATC),h4
 
 [Contents:]

doc/src/Packages_user.txt

@@ -38,6 +38,7 @@ int = internal library: provided with LAMMPS, but you may need to build it
 ext = external library: you will need to download and install it on your machine :ul
 
 Package, Description, Doc page, Example, Library
+"USER-ADIOS"_Packages_details.html#PKG-USER-ADIOS, dump output via ADIOS, "dump adios"_dump_adios.html, USER/adios, ext
 "USER-ATC"_Packages_details.html#PKG-USER-ATC, Atom-to-Continuum coupling, "fix atc"_fix_atc.html, USER/atc, int
 "USER-AWPMD"_Packages_details.html#PKG-USER-AWPMD, wave packet MD, "pair_style awpmd/cut"_pair_awpmd.html, USER/awpmd, int
 "USER-BOCS"_Packages_details.html#PKG-USER-BOCS, BOCS bottom up coarse graining, "fix bocs"_fix_bocs.html, USER/bocs, no