Add a deprecated :tab-detach

doc/changelog.asciidoc

@@ -33,10 +33,10 @@ Fixed
 
 - More consistent sizing for favicons with vertical tabs.
 
-Removed
-~~~~~~~
+Deprecated
+~~~~~~~~~~
 
-- `:tab-detach` has been removed, as `:tab-give` without argument can be used
+- `:tab-detach` has been deprecated, as `:tab-give` without argument can be used
   instead.
 
 v1.0.2

qutebrowser/browser/commands.py

@@ -557,6 +557,12 @@ class CommandDispatcher:
         tabbed_browser.tabopen(self._current_url())
         self._tabbed_browser.close_tab(self._current_widget(), add_undo=False)
 
+    @cmdutils.register(instance='command-dispatcher', hide=True, scope='window',
+                       deprecated='Use :tab-give instead!')
+    def tab_detach(self):
+        """Deprecated way to detach a tab."""
+        self.tab_give()
+
     def _back_forward(self, tab, bg, window, count, forward):
         """Helper function for :back/:forward."""
         history = self._current_widget().history