Plugin system and docker update

- Use buffering in nchan communication
- Start any background command delayed
- Added openDokcer routine
- Code optimization

plugins/dynamix/include/StartCommand.php

@@ -39,9 +39,7 @@ if ($command && strncmp($name,$path,strlen($path))===0) {
     $pid = pgrep($name);
   } elseif ($start or !pgrep($name)) {
     // start command in background and return pid
-    exec("echo \"$name $args\" | at -M now >/dev/null 2>&1");
-    usleep(100000);
-    $pid = pgrep($name);
+    $pid = exec("$docroot/webGui/scripts/start_command $name $args");
   }
 }
 echo $pid;