Extract to dict

[renae-r]

Added a method that is essentially the inverse of the extract_from_dict method to easily export an extract object to a dict. This with the idea that it will be easier for users to share submission-ready extract definitions this way. Accompanying doc updates.

[codecov[bot]]

Codecov Report

Merging #65 (cd83282) into master (f42fd77) will increase coverage by 0.57%. The diff coverage is 80.95%.

@@            Coverage Diff             @@
##           master      #65      +/-   ##
==========================================
+ Coverage   76.31%   76.88%   +0.57%     
==========================================
  Files          12       12              
  Lines         591      610      +19     
==========================================
+ Hits          451      469      +18     
- Misses        140      141       +1     

Impacted Files	Coverage Δ
src/ipumspy/api/extract.py	87.34% <78.94%> (+1.85%)	:arrow_up:
src/ipumspy/api/core.py	66.04% <100.00%> (+0.21%)	:arrow_up:
src/ipumspy/api/exceptions.py	100.00% <100.00%> (ø)

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[khwilson]

The tests will get you every time for black. :-)

If you want, we can add some pre-commit hooks that automatically run black

[khwilson]

LGTM!

[renae-r]

Yay! Also added pre-commit hook to run black as suggested, because I am going to keep forgetting to run it myself. Leaving the pickle thing in the pile of things to improve but that aren't emergencies.

[khwilson]

Nice!