Change quit to only close the current window.

Adds the --all option to quit to behave the same as before.
Also changes wq to wqa to reflect the change.

qutebrowser/app.py

@@ -679,14 +679,18 @@ class Quitter:
 
     @cmdutils.register(instance='quitter', name='quit')
     @cmdutils.argument('session', completion=miscmodels.session)
-    def quit(self, save=False, session=None):
+    def quit(self, all=False, save=False, session=None):
         """Quit qutebrowser.
-
         Args:
+            all: When given, closes all windows and kills the current instance
             save: When given, save the open windows even if auto_save.session
                   is turned off.
             session: The name of the session to save.
         """
+        if  not all:
+            window = QApplication.activeWindow()
+            window.close()
+            return
         if session is not None and not save:
             raise cmdexc.CommandError("Session name given without --save!")
         if save:

qutebrowser/config/configdata.yml

@@ -4,7 +4,8 @@ aliases:
   default:
     w: session-save
     q: quit
-    wq: quit --save
+    qa: quit --all
+    wqa: quit --all --save
   type:
     name: Dict
     keytype: