Add methods for adding and replacing with a Mimi PseudoDistribution

[lrennels]

No description provided.

[codecov]

Codecov Report

Merging #852 (3bf34e7) into master (39472d5) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #852   +/-   ##
=======================================
  Coverage   84.30%   84.30%           
=======================================
  Files          40       40           
  Lines        3792     3792           
=======================================
  Hits         3197     3197           
  Misses        595      595           

Flag	Coverage Δ
unittests	84.30% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/mcs/defmcs.jl	94.61% <100.00%> (ø)

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