Python wrapper issue

[lee-matthews]

There is an issue with the receive function in the python wrapper. I've corrected the problem but I don't have push rights to this repository. Here is my commit message

Added the necessary wrapper info for _vxi11_receive_timeout to avoid 'NameError: global name '_vxi11_receive_timeout' is not defined errors' and fixed the argtypes for _vxi11_receive

Please find attached the modified vxi11.py file

vxi11.py.zip