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* Move to Section python
* Update to Standards version 4.3.0
* Move to source 3.0 quilt
* Add build depends to be able to run tests while building the package
* let pybuild autodetect python*-nazca dependencies
* Add a python3-nazca package

For now ignore failing tests.

Explicitly drop packaging from sdist
Add tests to sdist

Some py2 tests fails but looks unrelated.

Otherwise we can't run tests on system having py35 or py36 or py38.

see: https://docs.scipy.org/doc/numpy/user/numpy-for-matlab-users.html#array-or-matrix-which-should-i-use

The seed must be fixed in the module where the random function is called. To do
that, we have to patch the randint function.

Fixing the seed in the test module is not enought, as the randint function the
minhashing module is *an other* instance of the function.

(and 0.125 is rounded to 0.12 in python3. It was 0.13 in python2)

If two sets are empty, one can't compute the distance between the two. Let's
return 1.

All the processing objects have a `weight` attribute so they can be mixed each
other with their own weighting. Let's use it !

This attribute was unsed until now.

Differential Revision: https://phab.logilab.fr/D2066