Unified Interface: Absolute Tolerance

[PaulJonasJost]

Add tolerance to the unified interface. Some optimizers not supported, especially Dlib with epsilon, though epsilon is not strictly a tolerance!

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Codecov Report

:x: Patch coverage is 88.23529% with 4 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 84.35%. Comparing base (bc7d89a) to head (e5ab895).

Files with missing lines	Patch %	Lines
pypesto/optimize/optimizer.py	88.23%	4 Missing :warning:
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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1660      +/-   ##
===========================================
- Coverage    84.37%   84.35%   -0.02%     
===========================================
  Files          164      164              
  Lines        14320    14354      +34     
===========================================
+ Hits         12082    12109      +27     
- Misses        2238     2245       +7     

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[PaulJonasJost]

closes #1646