Swap mp backend and update interaction parameters easily

[cbouy]

• Added a parameters argument in Fingerprint to easily update the parameters used by an interaction, instead of defining a new interaction class (fixes #118).
• The multiprocessing and pickling backends have been switched to multiprocess and dill respectively, and the parallel implementation has been improved. Users should now be able to define custom interactions in Jupyter notebooks, IPython and so on without any issue (fixes #117, fixes #86, fixes #46).

[codecov[bot]]

Codecov Report

Merging #128 (add8bea) into master (433a400) will increase coverage by 0.44%. The diff coverage is 93.99%.

:exclamation: Current head add8bea differs from pull request most recent head b233f60. Consider uploading reports for the commit b233f60 to get more accurate results

@@            Coverage Diff             @@
##           master     #128      +/-   ##
==========================================
+ Coverage   95.96%   96.40%   +0.44%     
==========================================
  Files          11       14       +3     
  Lines        1066     1114      +48     
==========================================
+ Hits         1023     1074      +51     
+ Misses         43       40       -3     

Impacted Files	Coverage Δ
prolif/interactions/utils.py	73.33% <73.33%> (ø)
prolif/parallel.py	78.31% <77.77%> (+25.12%)	:arrow_up:
prolif/fingerprint.py	96.50% <97.77%> (+1.47%)	:arrow_up:
prolif/interactions/base.py	98.83% <98.83%> (ø)
prolif/__init__.py	100.00% <100.00%> (ø)
prolif/ifp.py	100.00% <100.00%> (ø)
prolif/interactions/__init__.py	100.00% <100.00%> (ø)
prolif/interactions/interactions.py	100.00% <100.00%> (ø)
prolif/molecule.py	99.33% <100.00%> (ø)
prolif/plotting/network.py	96.20% <100.00%> (ø)
... and 2 more