Prefer mcs over dmcs

[Phoenix1369]

Handles #285

[codecov-io]

Codecov Report

Merging #333 into master will increase coverage by 0.04%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #333      +/-   ##
==========================================
+ Coverage   76.38%   76.42%   +0.04%     
==========================================
  Files         129      129              
  Lines        4692     4692              
==========================================
+ Hits         3584     3586       +2     
+ Misses       1108     1106       -2

Impacted Files	Coverage Δ
dmoj/executors/MONOCS.py	9.09% <0%> (ø)	⬆️
dmoj/cptbox/sandbox.py	74.51% <0%> (+0.32%)	⬆️
dmoj/executors/base_executor.py	85.85% <0%> (+0.32%)	⬆️

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[Xyene]

LGTM.