Display sbatch output

[colinsauze]

Fixes issue #137 and displays the output of sbatch (e.g. "Submitted batch job 127").

It turns out that at displays the job number/status via stderr and that is what was causing it to appear on screen. Sbatch uses stdout, so this code captures and displays that output.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.48%. Comparing base (7c12384) to head (33f499c).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #140      +/-   ##
==========================================
+ Coverage   87.46%   87.48%   +0.01%     
==========================================
  Files          13       13              
  Lines         630      631       +1     
==========================================
+ Hits          551      552       +1     
  Misses         79       79              

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[abhidg]

Looks good!