Creates a parallel, array-style vector, where the user provides the array space to store the vector values.
comm - the MPI communicator to use
bs - block size, same meaning as VecSetBlockSize()
n - local vector length, cannot be PETSC_DECIDE
N - global vector length (or PETSC_DECIDE to have calculated)
array - the user provided array to store the vector values
vv - the vector
Use VecDuplicate() or VecDuplicateVecs() to form additional vectors of the same type as an existing vector.
If the user-provided array is NULL, then VecPlaceArray() can be used at a later stage to SET the array for storing the vector values.
PETSc does NOT free the array when the vector is destroyed via VecDestroy(). The user should not free the array until the vector is destroyed.