Added permanent (count-independent) tab hide according to perm-hide variable.

qutebrowser/config/configdata.py

@@ -360,6 +360,10 @@ DATA = collections.OrderedDict([
          SettingValue(typ.Bool(), 'false'),
          "Hide the tabbar if only one tab is open."),
 
+        ('perm-hide',
+         SettingValue(typ.Bool(), 'false'),
+         "Hide permanently."),
+
         ('wrap',
          SettingValue(typ.Bool(), 'true'),
          "Whether to wrap when changing tabs."),

qutebrowser/mainwindow/tabwidget.py

@@ -106,7 +106,8 @@ class TabBar(QTabBar):
     def autohide(self):
         """Auto-hide the tabbar if needed."""
         auto_hide = config.get('tabs', 'auto-hide')
-        if auto_hide and self.count() == 1:
+        perm_hide = config.get('tabs', 'perm-hide')
+        if perm_hide or auto_hide and self.count() == 1:
             self.hide()
         else:
             self.show()