Generalized save

[Qfl3x]

#309

Still needs some docs

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 69.61%. Comparing base (ee64a86) to head (8aa1edc). Report is 138 commits behind head on master.

Files with missing lines	Patch %	Lines
src/DatasetAPI/Datasets.jl	0.00%	6 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #347      +/-   ##
==========================================
- Coverage   69.74%   69.61%   -0.13%     
==========================================
  Files          12       12              
  Lines        1702     1774      +72     
==========================================
+ Hits         1187     1235      +48     
- Misses        515      539      +24     

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[lazarusA]

more importantly doc strings and tests 😄 . But, I would like to have the opinion of @meggart on this?