Fix functions missing from __all__.

[weaverba137]

This PR closes #1094, and adds a little bit more documentation to the docstring.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8707443) 70.73% compared to head (6e477ff) 70.74%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1097   +/-   ##
=======================================
  Coverage   70.73%   70.74%           
=======================================
  Files          64       64           
  Lines        4483     4484    +1     
=======================================
+ Hits         3171     3172    +1     
  Misses       1312     1312           

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[rosteen]

Looks good to me, thanks. Would be nice to add an spPlate test as well that uses this, but that can be a separate follow-up (and you don't necessarily have to be the one to do it!)