Basic vector code, without a coordinate system class

All calculations essentially occur in the same frame.
i, j, k and x, y, z are imported as base vectors and base scalars by default on importing sympy.vector.
delop is a Del operator instance.

Example:

>>> v = 3*i - j
>>> delop ^ v
0

(delop ^ v represents curl of v)
What's the use case for user access to `Del`? It seems that all they'd ever need is an instance of it, which is already provided in `delop`. Don't think there is an issue with this, just wondering if there is a reason to make it imported if I did `from sympy.vector import *`.