vvmatrix: Add member function data() to get access to the matrix elements.
Add CUDA utility classes.
vvcudatransfunc: Separate device and host code.
vvrayrend: Separate device and host code.
vvrayrend: Compile fixes.
vvrayrend: Use Cuda/Array class instead of raw cudaArray's.
vvrayrend: Use Cuda/AutoPointer instread of raw pointers.
vvrayrend: Remove dependency from vvrayrend.h and vvvoldesc.h.