Various improvements

[yannikschaelte]

• Document pickling paradigm in ABCSMC class (see doc/sampler.rst).
• Always use lazy evaluation in updates.
• Restructure run function of ABCSMC class.

[codecov-io]

Codecov Report

Merging #216 into develop will decrease coverage by 0.08%.
The diff coverage is 76.19%.

@@             Coverage Diff             @@
##           develop     #216      +/-   ##
===========================================
- Coverage     82.4%   82.31%   -0.09%     
===========================================
  Files           84       84              
  Lines         4467     4473       +6     
===========================================
+ Hits          3681     3682       +1     
- Misses         786      791       +5

Impacted Files	Coverage Δ
pyabc/epsilon/base.py	91.3% <ø> (ø)	⬆️
pyabc/distance/base.py	83.67% <ø> (ø)	⬆️
pyabc/epsilon/epsilon.py	87.83% <100%> (+0.16%)	⬆️
pyabc/epsilon/temperature.py	89.87% <100%> (ø)	⬆️
pyabc/acceptor/acceptor.py	91.81% <100%> (+0.9%)	⬆️
pyabc/sampler/base.py	94.11% <50%> (-3.96%)	⬇️
pyabc/distance/distance.py	80.95% <62.5%> (-0.65%)	⬇️
pyabc/smc.py	94.38% <85.29%> (-0.3%)	⬇️
pyabc/sampler/redis_eps/cli.py	79.85% <0%> (-0.72%)	⬇️

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