This avoids the confusion between Zero() and IsZero() which sounds like they should be related
to one another but are not. This makes IsEmpty the counterpart to Reset. Add check for Zero in allMatrix
Fixes#1083.
Updates #1081.
blas64: add length field N to Vector
Alongside, fix the implementation of mat.VecDense and mat.Diagonal, as well as other changes needed to fix this change.
Fixes#736.
This merges the three packages, matrix, mat64, and cmat128. It then renames this big package to mat. It fixes the import statements and corresponding code