Efficiently interface Julia simulators via pyjulia

[yannikschaelte]

• Add pyabc.external.julia submodule for Julia calls via PyJulia.

fixes #493

[codecov-commenter]

Codecov Report

Merging #514 (e4e5629) into develop (e4fdc78) will decrease coverage by 0.15%.
The diff coverage is 82.27%.

@@             Coverage Diff             @@
##           develop     #514      +/-   ##
===========================================
- Coverage    88.44%   88.28%   -0.16%     
===========================================
  Files          122      125       +3     
  Lines         7353     7424      +71     
===========================================
+ Hits          6503     6554      +51     
- Misses         850      870      +20     

Impacted Files	Coverage Δ
pyabc/__init__.py	100.00% <ø> (ø)
pyabc/external/__init__.py	100.00% <ø> (ø)
pyabc/model.py	85.45% <50.00%> (-3.01%)	⬇️
pyabc/external/julia/jl_pyjulia.py	82.35% <82.35%> (ø)
pyabc/external/julia/__init__.py	100.00% <100.00%> (ø)
pyabc/external/r/__init__.py	100.00% <100.00%> (ø)
pyabc/external/r/r_rpy2.py	94.36% <100.00%> (ø)
pyabc/weighted_statistics.py	92.06% <0.00%> (-3.18%)	⬇️
pyabc/sampler/mapping.py	95.00% <0.00%> (-2.50%)	⬇️
pyabc/sampler/redis_eps/work.py	84.70% <0.00%> (-2.36%)	⬇️
... and 1 more

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