Support for implicit namespace packages.

[tristanlatr]

This is still a WIP

[codecov]

Codecov Report

Attention: Patch coverage is 90.62500% with 6 lines in your changes missing coverage. Please review.

Project coverage is 92.79%. Comparing base (02063d3) to head (644e888).

Files with missing lines	Patch %	Lines
pydoctor/model.py	90.47%	3 Missing and 3 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #871   +/-   ##
=======================================
  Coverage   92.79%   92.79%           
=======================================
  Files          47       47           
  Lines        8468     8510   +42     
  Branches     1550     1560   +10     
=======================================
+ Hits         7858     7897   +39     
- Misses        350      352    +2     
- Partials      260      261    +1     

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[github-actions]

According to pydoctor_primer, this change doesn't affect pydoctor warnings on a corpus of open source code. ✅