hardware: Add another town to test with

Signed-off-by: Kai Blin <kai@samba.org>
webapp: Add a 'back' button

Signed-off-by: Kai Blin <kai@samba.org>
webapp: Don't trigger clear when not needed

Signed-off-by: Kai Blin <kai@samba.org>
server: Sanity check travel and allow resetting route

Signed-off-by: Kai Blin <kai@samba.org>
server: Also allow force-forwarding

Signed-off-by: Kai Blin <kai@samba.org>
webapp: Allow to force-forward when shift is pressed

Signed-off-by: Kai Blin <kai@samba.org>