Templated VQwSubsystemParity for Sum, Difference, Ratio to use T::operator+, T::operator- etc

[wdconinc]

Is your feature request related to a problem? Please describe.
There are a lot of redundant implementations of VQwSubsystemParity::Sum,Different,Ratio in the derived classes.

japan/Parity/include/VQwSubsystemParity.h

Line 65 in 06ededf

virtual void Sum(VQwSubsystem *value1, VQwSubsystem *value2) = 0;

A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
I'm always frustrated, but that's neither here nor there.

Describe the solution you'd like
These are not necessary if we inherit from e.g. VQwSubsystemParity and define

virtual void Sum(T* value1, T* value2) { *this = *value1; *this += *value2; }
//etc

Describe alternatives you've considered
Status quo is always an alternative.