make binding responsible for going to parent dir work in tag editor

src/help.cpp

@@ -293,6 +293,7 @@ void Help::GetKeybindings()
 	*w << DisplayKeys(Key.Space)			<< "Select/deselect song (right column)\n";
 	*w << DisplayKeys(&Key.VolumeDown[0], 1)	<< "Previous column\n";
 	*w << DisplayKeys(&Key.VolumeUp[0], 1)		<< "Next column\n";
+	*w << DisplayKeys(Key.GoToParentDir)		<< "Go to parent directory (left column, directories view)\n";
 #	endif // HAVE_TAGLIB_H
 	
 	

src/ncmpcpp.cpp

@@ -533,6 +533,13 @@ int main(int argc, char *argv[])
 				myBrowser->Main()->Reset();
 				myBrowser->EnterPressed();
 			}
+#			ifdef HAVE_TAGLIB_H
+			else if (myScreen->ActiveWindow() == myTagEditor->Dirs && myTagEditor->CurrentDir() != "/")
+			{
+				myTagEditor->Dirs->Reset();
+				myTagEditor->EnterPressed();
+			}
+#			endif // HAVE_TAGLIB_H
 		}
 		else if (Keypressed(input, Key.Enter))
 		{