[maven-release-plugin] prepare release v5.1.0
[maven-release-plugin] prepare for next development iteration
Merge branch 'master' into next
Catch NoSuchMethodError exception around BluetoothSocket.isConnected().
Remoted unnecessary comment.
Merge remote-tracking branch 'origin/next' into next
Merge branch 'pr/87' into next
Replace tabs with 4 spaces.
Make sure trace source preferences are initialized in legacy layout.

Fixed #74.