The interface of that function has changed and includes two additional
parameters, which haven't been added to the Python interface either.
This showed up by trying to run the simple.py example.

Thanks to Giacomo Fiorin for figuring this out with NAMD/Colvars.
This requires linking with -Xlinker -export-dynamic or equivalent,
which is the default when using python-config to provide linker flags.
We will fall back to loading the DSO in case the initial load fails.

0aebb2eabea6ae3f5365951335ac3d698ab9ad9e

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The return value of `lammps_get_last_error_message` now encodes if the last
error was recoverable or should cause an `MPI_Abort`. The driving code is
responsible of reacting to the error and calling `MPI_Abort` on the
communicator it passed to the LAMMPS instance.

Thermo data of the last run is now accessable through the `last_run.thermo`
property. This is a dictionary containing the data columns of thermo output.
All run data is kept as list and can be found in the `runs` property.
See issue #144

This implements the requested feature in issue #145. The `write_script`
method now gives you a way of dumping out all used commands into a
LAMMPS input script file.

Note: this also dumps all commands which are indirectly issued by PyLammps

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This option allows forcing LAMMPS output to be printed to the console.

These can be activated using the -DLAMMPS_EXCEPTIONS compiler flag.
It has no effect for regular execution. However, while using
it as a library, any issued command will capture the exception
and save its error message. This can be queried using the
lammps_has_error() and lammps_get_last_error_message() methods.

The Python wrapper checks these in order to rethrow these errors
as Python exceptions. See issue #146.

(cherry picked from commit 6c154bb0b67a13d38968bc42d31013b97f87db75)

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