guided mode with coordinates as parameters

Hi,
If you want to use the command "guided" with parameters lat lon alt, mavproxy runs in an error because latlon was not defined on a subsequent call.
A possible fix seems to be quite simple:
mavproxy_mode.py, line 46-47:
latitude = float(args[0])
longitude = float(args[1])
should e.g. replaced with:
latlon = [float(args[0]), float(args[1])]

By the way, thanks for maintaining and developing mavproxy - great project!
Cheers,
moses

Open mavproxy_mode.py and inspect lines 46-47, then reproduce the guided command with latitude, longitude, and altitude parameters. Done means a subsequent call no longer fails because latlon is undefined and the coordinates are accepted.

Written by the indexing model from the issue text.