Added "dabba capture stop" to stop capture threads.
Added "dabba capture stop" to stop capture threads.

The command "dabba capture stop" is a new command to stop already
running capture threads. It accepts the argument "--id <id>",
where <id> is the number given back by "dabba list"

eroullit/dabba,eroullit/dabba,eroullit/dabba,eroullit/dabba