Fix error in Polynomial.coordinate
add Term.from_monomial and fix minor bug in Term.format
Basic algorithm from "fast and stable polynomial solving" working for a simple example
Add Polynomial.coordinates
Fixed bug related to basis size and now working for three vars
Factor some of Term.evaluate into evaluate_monomial
Can solve basis two-variables problem with QR version of algorithm
Fixed incomplete basis detection
Deal with raising polynomials to the power of zero
Added partial_row_echelon_form and dealt with subtleties of required vs nuisance monomials that fall out during LU
Fixed some minor formatting
Further generalized row echelon form and can now solve the two circles problem
minor stuff