Generator : Refurbished version. Full integration with vector_operations.hpp,...

Generator : Refurbished version. Full integration with vector_operations.hpp, partial integration with matrix_operations.hpp (exluding GEMV, GEMM, FFT, LU)

- Several additional operators supported (argmax, argmin, diag, row, column, ...)
- More stability
- Auto-tuning shortcuts removed (there is an ongoing python project to perform smarter auto-tuning)
- Significant performance improvement on GEMM (matches CuBlas and clAmdBlas)