Fix issue 160 - replace scipy interp2d by RectBivariateSpline

[dschick]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 24.36%. Comparing base (54ce349) to head (122f5eb).
Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
udkm1Dsim/simulations/heat.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #161   +/-   ##
========================================
  Coverage    24.36%   24.36%           
========================================
  Files           10       10           
  Lines         3066     3066           
========================================
  Hits           747      747           
  Misses        2319     2319           

Files with missing lines	Coverage Δ
udkm1Dsim/simulations/heat.py	8.75% <33.33%> (ø)