Changes:
    
    - Improve the -ecm patch.
    - Add -formatargspec patch to silence doc-building warnings.
    - Add -data-elliptic_curves_large subpackage.
    - Build with bliss, coxeter3, and mcqd support.
    - Fix typo that made the singular.hlp file inaccessible.
    - Add more gap packages to get closer to the set shipped by upstream.
    - Refactor Requires so they apply to the correct subpackages.
    - More python 3 patching due to changes in python 3.8.
    - Use upstream's method of installing jupyter support.
    - Obsolete the sagemath-notebook-export subpackage.