Another IMEX RK embedded method of order 5(4)

[brownbaerchen]

This one is newer and seems to be slightly better.

[codecov]

Codecov Report

Patch coverage: 94.63% and project coverage change: +0.14% 🎉

Comparison is base (8631eeb) 72.93% compared to head (95af8c0) 73.07%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #355      +/-   ##
==========================================
+ Coverage   72.93%   73.07%   +0.14%     
==========================================
  Files         269      269              
  Lines       22894    23040     +146     
==========================================
+ Hits        16697    16836     +139     
- Misses       6197     6204       +7     

Files Changed	Coverage Δ
...SDC/implementations/sweeper_classes/Runge_Kutta.py	94.76% <94.44%> (-0.22%)	⬇️
...ence_controller_classes/estimate_embedded_error.py	84.21% <100.00%> (ø)
...ns/problem_classes/AcousticAdvection_1D_FD_imex.py	100.00% <100.00%> (+2.00%)	⬆️

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