stub for dict module
fixed identically named tests
numvar() and order() methods
python sparse monomials, first tranche
more tests on DictMonomials
improved (sparse) monomial representation
MVPolyDict addition
multiplication of monomials, negation and subtraction of polynomials
improved dictionary merge nonzero
multiplication, equality
Merge branch 'master' into python-dict
Merge branch 'master' into python-dict
Merge branch 'master' into python-dict
Merge branch 'master' into python-dict
Added Euler-Goldbach example to documentation
initial dtype setup
MVPolyDict dtype tests
Merge branch 'master' into python-dict
MVpolyDict differentiation
MVPolyDict diff() cleanup and further tests