The cfdemCompLIG utility has been updated to use of CMake to compile LIGGGHTS.
This will generate a liggghts binary and libliggghts.so shared library which
can be used by CFDEMcoupling.
Users need to add the new environment variable CFDEM_LIGGGHTS_BIN_DIR into
their bashrc file, e.g.:
export CFDEM_LIGGGHTS_SRC_DIR=$PFM_DIR/LIGGGHTS/src
export CFDEM_LIGGGHTS_BIN_DIR=$PFM_DIR/LIGGGHTS/src-build
Other bash utilities in etc/functions.sh have also been updated, including
parDEMrun and parCFDEMrun.
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