Better support AMD device queries

Fix uint subtraction

Enables inplace division (__itruediv__) for pyopencl.array.Array class.

Fix crashes in read-only SVM test (cf gh-378)

Fix, test usage of read-only SVM

See merge request !122

Drop support for old buffer interface

Run pyupgrade and placate flake8-quotes

Doc fixes

Fix memory pool creation kwarg spec in wrapper (Closes gh-366)