Refactor: Remove nr_samples_per_parameter

[yannikschaelte]

Solves #54 and #352.

• Removes the double loop over particles and distances, and the problematic handling of rejected and accepted simulation lists per particle
• Removes some TODO this only works with nr_samples_per_parameter=1
• Database left untouched atm

[codecov-io]

Codecov Report

Merging #422 (1630238) into develop (6446a77) will decrease coverage by 40.75%.
The diff coverage is 33.33%.

@@             Coverage Diff              @@
##           develop     #422       +/-   ##
============================================
- Coverage    84.08%   43.33%   -40.76%     
============================================
  Files           91       96        +5     
  Lines         5260     5838      +578     
============================================
- Hits          4423     2530     -1893     
- Misses         837     3308     +2471     

Impacted Files	Coverage Δ
pyabc/distance/__init__.py	100.00% <ø> (ø)
pyabc/inference/__init__.py	100.00% <ø> (ø)
pyabc/petab/amici.py	0.00% <0.00%> (-85.19%)	⬇️
pyabc/petab/base.py	0.00% <0.00%> (-67.35%)	⬇️
pyabc/populationstrategy.py	52.70% <ø> (-42.17%)	⬇️
pyabc/sampler/redis_eps/server_starter.py	84.61% <ø> (ø)
pyabc/sge/sge.py	0.00% <0.00%> (-45.09%)	⬇️
pyabc/storage/__init__.py	100.00% <ø> (ø)
pyabc/transition/__init__.py	100.00% <ø> (ø)
pyabc/visualization/histogram.py	12.82% <0.00%> (-87.18%)	⬇️
... and 109 more

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