Add warning, if fixed parameter is supposed to be profiled

[PaulJonasJost]

closes #1154

[dweindl]

Thanks 👍

[codecov-commenter]

Codecov Report

Merging #1155 (3f94c4c) into develop (160c2a8) will decrease coverage by 3.80%.
Report is 402 commits behind head on develop.
The diff coverage is 87.95%.

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@@             Coverage Diff             @@
##           develop    #1155      +/-   ##
===========================================
- Coverage    88.16%   84.37%   -3.80%     
===========================================
  Files           79      148      +69     
  Lines         5257    11648    +6391     
===========================================
+ Hits          4635     9828    +5193     
- Misses         622     1820    +1198     

Files	Coverage Δ
pypesto/C.py	100.00% <100.00%> (ø)
pypesto/__init__.py	100.00% <100.00%> (ø)
pypesto/engine/__init__.py	100.00% <100.00%> (ø)
pypesto/engine/multi_process.py	93.10% <100.00%> (+0.79%)	⬆️
pypesto/engine/multi_thread.py	100.00% <100.00%> (ø)
pypesto/engine/single_core.py	100.00% <100.00%> (ø)
pypesto/engine/task.py	100.00% <100.00%> (ø)
pypesto/ensemble/__init__.py	100.00% <100.00%> (ø)
pypesto/ensemble/task.py	100.00% <100.00%> (ø)
pypesto/hierarchical/__init__.py	100.00% <100.00%> (ø)
... and 138 more