Add MerkleBlock::conceal_other method

[dr-orlovsky]

Closes #162

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.3%. Comparing base (3425446) to head (4ab7d0d).

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #164     +/-   ##
========================================
+ Coverage    66.7%   67.3%   +0.6%     
========================================
  Files          20      20             
  Lines        2051    1982     -69     
========================================
- Hits         1369    1334     -35     
+ Misses        682     648     -34     

Flag	Coverage Δ
rust	67.3% <100.0%> (+0.6%)	⬆️

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