Communicate walltimer aborts to the queuing system
Description
This MR extends the new walltimer slightly to create an empty file 'walltime_abort' when the walltimer is stopping the code. This file can be used as a communication channel to interact with the queueing system. It allows to daisy chain several octopus runs in a self-submitting job script.
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Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.