Tweaks to nekobee

It's not really release-worthy, but I fixed a problem with the file for nekobee, and also modified nekobee_ports.c to have sensible range hints. This follows a bit of testing in Rosegarden, where the "default" controls set nekobee to silly values (with the tuning all the way up, and stuff like that). So, with this in place, you should get a reasonable default sound when you're using Rosegarden.

It's in the Subversion repository, but as I say, there isn't a tarball yet. I have a couple of other things planned before I make another release.