Use fixed seed double-fp heats versus others

[ckormanyos]

No description provided.

[ckormanyos]

See also #757

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.2%. Comparing base (9e39fe5) to head (ab6bfb0).

Additional details and impacted files

@@           Coverage Diff           @@
##           develop    #758   +/-   ##
=======================================
  Coverage     96.2%   96.2%           
=======================================
  Files          300     300           
  Lines        29466   29466           
=======================================
  Hits         28332   28332           
  Misses        1134    1134           

Files with missing lines	Coverage Δ
...est_cpp_double_float_bessel_versus_bin_and_dec.cpp	100.0% <100.0%> (ø)

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[ckormanyos]

Failure is spurious runner on drone. Merging