Commit fixing that threads not cleaning up after themselves.

Commit fixing that threads not cleaning up after themselves.

As it turns out, I forgot to uncomment lines detaching the GW threads, so that as they are cancelled they can automatically call clean up handlers.
This also fixes related bug, where messages sent to the board after the gw was activated and deactivated, are delivered once gw is activated again. (Unless the whole board was reset in the meantime.)