Add CalibrationData.reports_info() method

[takluyver]

This is meant to give a condensed summary of where a group of constants have come from:

I'll open this as a draft to remind us that #408 and #373 are going first.

[codecov]

Codecov Report

❌ Patch coverage is 84.21053% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.05%. Comparing base (5d5a497) to head (b72df91).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
src/extra/calibration.py	84.21%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #430      +/-   ##
==========================================
+ Coverage   72.83%   73.05%   +0.21%     
==========================================
  Files          35       35              
  Lines        6048     6086      +38     
==========================================
+ Hits         4405     4446      +41     
+ Misses       1643     1640       -3     

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[philsmt]

Thanks, looks nice and useful. LGTM!

[philsmt]

Nitpicking here on a private function, but some more documentation what this function does may be nice, to make it is easier to use it in other places.