ex 2.92 - try adjoin-term using accessors only
ex 2.92 - bug fix - order must be an integer
ex 2.89 - fix - merge-term & order should be int
ex 2.92 - debuging for new dense-add-terms...
ex 2.92 - problematic adjoin-term
ex 2.{89,92} - adjoin-term fix
ex 2.92 - add generic add-terms and switch to it
ex 2.92 - move termlist-equ? to generic
ex 2.92 - try to merge tests together
ex 2.92 - merge tests into poly-generic