Better error checking + map tools

This version gives you better errors if there are any problems with your setup (with USB or sys-bot). It also checks if there is a new release.

I've added some basic map tools, right now it just removes all your weeds.

Note that the iOS bundle identifier has changed, so you might need to uninstall before reinstalling as the new version, otherwise you'll have 2 of the same app on your iPhone/iPad.