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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Make.py is now used to enable exceptions support

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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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