Fix .nest.to_flat / to_lists

[hombit]

Fixes #89

The code example from #89 works now, but I'm not sure if I should add it as a test because of the Epyc server usage.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.71%. Comparing base (8197907) to head (ebcc24b).
Report is 76 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #90      +/-   ##
==========================================
+ Coverage   98.68%   98.71%   +0.03%     
==========================================
  Files          15       15              
  Lines         836      859      +23     
==========================================
+ Hits          825      848      +23     
  Misses         11       11              

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[github-actions]

Before [8197907]	After [c8e774b]	Ratio	Benchmark (Parameter)
5.29±0.05ms	5.37±0.07ms	1.01	benchmarks.NestedFrameReduce.time_run
267M	270M	1.01	benchmarks.ReassignHalfOfNestedSeries.peakmem_run
86.4M	86.6M	1	benchmarks.NestedFrameAddNested.peakmem_run
9.03±0.2ms	9.04±0.2ms	1	benchmarks.NestedFrameAddNested.time_run
89.6M	89.3M	1	benchmarks.NestedFrameQuery.peakmem_run
89.6M	89.3M	1	benchmarks.NestedFrameReduce.peakmem_run
257M	255M	0.99	benchmarks.AssignSingleDfToNestedSeries.peakmem_run
6.43±0.03ms	6.22±0.08ms	0.97	benchmarks.NestedFrameQuery.time_run
33.1±2ms	31.3±2ms	0.95	benchmarks.AssignSingleDfToNestedSeries.time_run
59.2±2ms	54.4±4ms	0.92	benchmarks.ReassignHalfOfNestedSeries.time_run

Click here to view all benchmarks.

[dougbrn]

Looks good, thanks!