dtwf/ped stats tests

[GertjanBisschop]

Adds statistical verification for the DTWF/FIXED PEDIGREES when recording additional nodes. This uses the existing machinery to compare the DTWF against the coalescent, as well as the pedigree framework against DTWF itself.

[codecov]

Codecov Report

Merging #2225 (e1490ce) into main (c6e9573) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2225   +/-   ##
=======================================
  Coverage   91.52%   91.52%           
=======================================
  Files          20       20           
  Lines       11334    11334           
  Branches     2302     2302           
=======================================
  Hits        10373    10373           
  Misses        523      523           
  Partials      438      438           

Flag	Coverage Δ
C	91.52% <ø> (ø)
python	98.70% <ø> (ø)

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[jeromekelleher]

Looks great!