A value of 1 is perfectly valid for the 2-norm of the constant vector
of a dot operation. Hence, the log2 of that value of 0 is also
perfectly valid. However, the offset of -1 in `getV0Parameter` applied
to that value yields an offset into a static lookup table of -1, which
triggers a segmentation fault.
This patch removes the offset of -1 for the log2 value of the 2-norm
in `getV0Parameter`.
The function `getV0Parameter()` returns a pointer to a static array,
which is not intended to be mutable. Reflect this in the return type
of the function.
