Support lmp.in alongside control.inp in LAMMPS run scripts

[Copilot]

LAMMPS run scripts were hardcoded to control.inp. Scripts now detect which input file (lmp.in or control.inp) is present in the working directory and invoke LAMMPS accordingly.

Changes

• lammps/bin/run_lammps_2024.02.07.sh / _mpi.sh — shell conditional selects lmp.in if present, else falls back to control.inp
• lammps/bin/run_lammps_2018.03.16.bat — Windows if exist equivalent logic
• mlip/bin/run_lammpsmlip_2020.12.24.sh / _mpi.sh — same shell conditional

Bash pattern applied:

if [ -f lmp.in ]; then
    INPUT_FILE=lmp.in
else
    INPUT_FILE=control.inp
fi
mpiexec -n ${PYIRON_CORES:=1} --oversubscribe lmp_mpi -in ${INPUT_FILE}

Batch pattern applied:

if exist lmp.in (
    lmp_serial.exe -in lmp.in
) else (
    lmp_serial.exe -in control.inp
)