Propagation of type aliases through class hierarchies

Getting your type aliases through a base class like QMCTraits becomes problematic when you have a templated base class.
```c++
template
class OneBodyJastrowOrbitalBsplineSoA :
public J1OrbitalSoA
{
// The following is so we can refer to type aliases(defs) below the
// templated base class in the object hierarchy
// Mostly QMCTraits here
using JBase = J1OrbitalSoA;
using RealType = typename JBase::RealType;
using ValueType = typename JBase::ValueType;
using GradType = typename JBase::GradType;
using PosType = typename JBase::PosType;
...
}
```
In fact getting these type aliases from J1OrbitalSoA has nothing to do with it being a OneBody..'s base class at all. Suggestions? I don't really think QMCTraits belongs in the class hierarchy at all, but sometimes getting a type from your inheritance tree seems more useful.