Better static analysis

[tristanlatr]

Give pydoctor a better understanding of symbols with multiple assignments.

This solves issue #623 but it also open the door to tackle #469, #591 as well as #348.

[codecov]

Codecov Report

Base: 92.43% // Head: 92.41% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (f96361d) compared to base (76de711).
Patch coverage: 93.01% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #669      +/-   ##
==========================================
- Coverage   92.43%   92.41%   -0.03%     
==========================================
  Files          45       48       +3     
  Lines        8029     8368     +339     
  Branches     1914     1981      +67     
==========================================
+ Hits         7422     7733     +311     
- Misses        353      370      +17     
- Partials      254      265      +11     

Impacted Files	Coverage Δ
pydoctor/templatewriter/__init__.py	92.54% <ø> (ø)
pydoctor/templatewriter/pages/__init__.py	90.69% <ø> (ø)
pydoctor/astutils.py	90.17% <76.00%> (-2.64%)	⬇️
pydoctor/symbols.py	92.54% <92.54%> (ø)
pydoctor/astbuilder.py	95.73% <96.03%> (-0.24%)	⬇️
pydoctor/model.py	95.01% <100.00%> (+0.10%)	⬆️
pydoctor/templatewriter/summary.py	88.74% <100.00%> (ø)
pydoctor/__init__.py	87.50% <0.00%> (ø)
pydoctor/epydoc/__init__.py	100.00% <0.00%> (ø)
... and 1 more

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[tristanlatr]

This code should go to a new library that pydoctor uses as a code model.