cbc69b9 Update to 1.3.

Authored and Committed by jjames 5 years ago
    Update to 1.3.
    
    Also:
    - Drop upstreamed patches: subexpr-lambdify, test-code-quality, tex-encoding.
    - Drop the python2 subpackage.
    - Add -python3 patch to ask cython to generate python 3 code.
    
        
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