chg: added leftShift of CanonicalForms
chg: use leftShift in computation of cyclotomic polys
chg: modular resultant for small finite fields
chg: added pruning of alg extensions
chg: pruning in conversion to factory
fix: messing up variables in newtonDiv
chg: got rid of unnecessary swapping variables
Merge pull request #618 from mmklee/alg_prune

Alg prune