Use the python array parameter wrapping code to handle POD pointer
parameters, rather than using code that is POD-pointer specific.
This makes wrapped pointers behave exactly the same as wrapped arrays,
except the way that the size is set for pointers.  This patch also
adds a test for the wrapped pointers.

Change-Id: I5b69606a95d94e03b53530f059c1d1e6b0921ce1