1.6 April 2020 build

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Started March 9, 2020, Completed April 6, 2020.

Uses Rubi 4.16.1 input data. Number of integrals 71,994. With grading for all CAS systems.

CAS systems used are : Rubi 4.16.1, Mathematica 12.1, Maple 2020, Maxima 5.43, Fricas 1.3.6, Sympy 1.5, Giac/XCAS 1.5 and Sagemath.