M2 interfaces to some functions

[turnip314]

Includes PrimaryDecomposition, Saturate, GroebnerBasis, and Radical. Will use M2 if available (will need to integrate this with ACSVSettings).

Note: M2 is picky and doesn't like certain characters in their variable names, so the workaround for now is to convert it to a new ring with basic variable names x0, x1, ..., then convert it back after.

EDIT: tests will probably fail because I'm currently manually loading m2 from my installation directory

[behackl]

I only read the changes, and did not locally test them -- but if this works for you (and apparently the tests still pass), I'm happy! Very nice, I like how the interface of the functions is now a little less messy! 🚀