Consistent behaviour for ScopingNoticeStream $scoped

We don't guess the current profile anymore if the value of the profile === -1

Also sets $this->scoped for all ScopingNoticeStream inheritors, which just
like in an Action can be null if we're not scoped in any way (logged in).

plugins/Mapstraction/actions/allmap.php

@@ -27,9 +27,7 @@
  * @link      http://status.net/
  */
 
-if (!defined('STATUSNET')) {
-    exit(1);
-}
+if (!defined('GNUSOCIAL')) { exit(1); }
 
 /**
  * Show a map of user's notices