Baseclass header

We slightly modify the baseclass header to contain the number of blocks and threads that will be used by the kernels. This will prevent us from having to recalculate these values in each of the GPU routines again and again. Strictly speaking, these values should be stored in the DefaultGPU-class, as they're not being used by the CPU implementation. However, the DefaultGPU-header will be regenerated when we call HyCuda again for some reason, thereby losing any changes we made. This is not true for the baseclass header.