polys: Extracted eqs_to_matrix() from solve_lin_sys()
polys: Added new solve_lin_sys() benchmark (10x8 GCD extensive)
polys: Don't reimplement global namespace modification hack
polys: Distinguish symbols from generators in domains
polys: Allow to pre-process domain in PolyRing()
polys: Don't repeat leading monomial algorithm in PolyElement
polys: Allow to pre-process order in PolyRing()
polys: Split monomialtools.py into monomials.py and orderings.py
polys: Switched to __all__-style imports
polys: Simplified PolyElement.__pow__()
polys: Added @public decorator and decorated functions

Decorate classes too when we drop Python 2.5 support.
polys: Fixed agca doctests after polys' import changes
polys: Added __hash__ to RealField and ComplexField
polys: Guard against negative exponents in PolyElement.__pow__
polys: Added support for comparison operators to PolyElement
polys: Added a comment about test_benchmark_czichowski_buchberger()
polys: Improved univariate case of Poly{Ring,Element}.drop()
polys: Added support for multivariate dense representation to PolyRing.ring_new()
polys: Add generators to the ring/field if they are Symbols
polys: Use is_Composite instead of getattr() hack