fix: check for wrong args in eliminate:  eliminate(I,a(1..4))
introduced new tokens: cring, cnumber,cmatrix
fix: typo in doc.
fix: allow overloading with static routines
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