FIX: empty return values were counted as failed/aborted

fexec now returns 'no output' for no output arguments

Updated changelog

CHG: print improvements

- widened state column for OUT_OF_MEMORY
- moved \b after sacct_query
- reduced wait in job finalization

CHG: updated changelog

NEW: Added tests for various output scenarios

FIX: unset mem values are now ignored

If 'mem' is empty, no --mem argument is passed
to sbatch such that default values of partitions
can be respected.

FIX: bug occurring with multiple submissions

If a user had mutliple active submissions get_active_jobs
returns all jobs. The assignment of state then failed.

FIX: Added initial value to MatlabJob.state UNKNOWN

When submitting many jobs, some of the jobs don't appear in squeue.
To handle them I changed the initial state to UNKNOWN.

NEW: added CHANGELOG

Create LICENSE