after an exception "all bets are off",
i.e. the user should be allowed to do anything to recover.
through setting Update::whichflag to 0, the guard against running commands during a run is removed.

this will trim warnings and error messages when compiling using the CMake
build system, which uses full paths. as a bonus,one can now see, if a
source is taken from a package or not.

this should help tracking down input file errors for many
common cases without having to repeat the run with -echo screen
and avoid having to explain how to use that feature all the time

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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.

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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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