reduce LineageTable
Minimalizes first, then replaces each of the values of a hash table H by its remainder on the division by the remaining values H.
If values H constitute a Gr\"obner basis of the ideal they generate, this method returns a reduced Gr\"obner basis.




Polynomials are normalized so that the leading coefficient is 1. Note that keys of nonminimal entries are retained, and the corresponding table value is null.
The object reduce is a method function.