Extract and test manual examples

[olexandr-konovalov]

Redoing #16 properly. This ensures that manual examples are regularly tested.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.71%. Comparing base (c6a04d2) to head (236ed03).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #34      +/-   ##
==========================================
- Coverage   99.85%   99.71%   -0.15%     
==========================================
  Files           5        5              
  Lines         709      709              
==========================================
- Hits          708      707       -1     
- Misses          1        2       +1     

Files with missing lines	Coverage Δ
lib/local.gd	100.00% <ø> (ø)

... and 1 file with indirect coverage changes

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[olexandr-konovalov]

This is ready for the review. I have automated test extraction and fixed or tweaked some manual examples to make tests pass. For now, I have a series of commits, so you can track what I have been doing easier.