Rename matrices.py to npmatrices.py

[stavros11]

Fixes #673. There is a name collision because matrices is the name of a module under backends but also defined in the __init__.py (see #674 for details). Here I rename matrices.py to npmatrices.py to fix this.

Qibojit only works using qiboteam/qibojit#92.

Checklist:

• Reviewers confirm new code works as expected.
• Tests are passing.
• Coverage does not decrease.
• Documentation is updated.

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (1a555b3) compared to base (8b0e0d4).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #677   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           80        80           
  Lines        10530     10532    +2     
=========================================
+ Hits         10530     10532    +2     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/qibo/backends/__init__.py	100.00% <100.00%> (ø)
src/qibo/backends/npmatrices.py	100.00% <100.00%> (ø)
src/qibo/backends/numpy.py	100.00% <100.00%> (ø)
src/qibo/backends/tensorflow.py	100.00% <100.00%> (ø)
src/qibo/tests/test_parallel.py	100.00% <100.00%> (ø)

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[renatomello]

I think this broke qibo.set_backend('qibojit').

In order to make it worrk with qibo==0.1.9dev0 and qibojit==0.0.5, I had to manually edit line 5 of my local install of qibojit/backends/matrices.py from

from qibo.backends.matrices import Matrices

to

from qibo.backends.npmatrices import NumpyMatrices as Matrices

[scarrazza]

@renatomello this PR was linked to qiboteam/qibojit#92, so please use qibojit main until we release a new version of the code.

[stavros11]

@renatomello yes this PR created incompatibility with previous qibojit versions which was fixed in qiboteam/qibojit#92 (see first post). If you use the latest qibojit master the issue should be fixed without having to manually change something.