fix linbox.doxy to be a discussion of overall library organization. (and make sure right stuff is on mainpage too)
primary form? Relative primary form of A? Primary form is similar to A and finest which is a direct sum of companion matrices Cfi such that, for all i, j, gcd(fi, fj) = 1 or fi or fj. Relative primary form is coarsest such decomposition.
this may soon be reversed, in fact.