5a519c8 Update to sagemath 8.8 (bz 1724394).

Authored and Committed by jjames 4 years ago
    Update to sagemath 8.8 (bz 1724394).
    
    Also:
    - Remove configparser dependencies (bz 1706597).
    - Fix broken sed conversion (bz 1706234).
    - Fix python2 versus python3 snafu (bz 1706337, 1707166).
    - Build and install sagetex (bz 1706322).
    
        
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