Use XOupoint instead of XOutputSeal in the APIs

[dr-orlovsky]

Includes fix from #289
Closes #290

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 26 lines in your changes missing coverage. Please review.

Project coverage is 18.3%. Comparing base (b374468) to head (af5a31b).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
src/persistence/stock.rs	0.0%	12 Missing ⚠️
src/persistence/memory.rs	0.0%	11 Missing ⚠️
src/persistence/index.rs	0.0%	2 Missing ⚠️
src/containers/partials.rs	0.0%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #291     +/-   ##
========================================
- Coverage    18.4%   18.3%   -0.0%     
========================================
  Files          38      38             
  Lines        8705    8711      +6     
========================================
  Hits         1598    1598             
- Misses       7107    7113      +6     

Flag	Coverage Δ
rust	18.3% <0.0%> (-<0.1%)	⬇️

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[zoedberg]

tACK af5a31b