kobas.fisher_test(a, b, c, d);
the upper left cell: the members of the term in the foreground list. [as integer]
the upper right cell: the foreground members that are not in the term. [as integer]
the lower left cell: the term members that are not in the foreground. [as integer]
the lower right cell: the members that are neither in the term nor in the foreground. [as integer]
the p-value.