Prevent infinite hangs in multiprocexec when exceptions are raised #17
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Added a thread monitor to multiprocexec, which runs for the first minutes of a simulation. This thread monitor catches exceptions raised by the individual processes and terminates all other processes if one fails. This ensures that the simulation doesn't hang when one process fails.
The thread monitor terminates itself automatically after 5 minutes of the simulation have passed to avoid any additional (albeit small) overhead could be introduced by this addition.
Fixes #16