Remove nstages method.

Author: michakraus

src/integrator.jl

@@ -71,7 +71,6 @@ hasnullvector(int::GeometricIntegrator) = hasnullvector(method(int))
 implicit_update(int::GeometricIntegrator) = implicit_update(method(int))
 nconstraints(int::GeometricIntegrator) = nconstraints(problem(int))
 Base.ndims(int::GeometricIntegrator) = ndims(problem(int))
-nstages(int::GeometricIntegrator) = nstages(tableau(method(int)))
 nlsolution(int::GeometricIntegrator) = nlsolution(cache(int))
 nullvector(int::GeometricIntegrator) = nullvector(method(int))
 tableau(int::GeometricIntegrator) = tableau(method(int))