Fix several issues with shortcut keys.

Do not drop  through shortcut key handling so  that spurious responses
are avoided.

The keyPressEvent handlers must call the super class implementation if
the event os not handled.

Correct a typo in the shortcut help display.

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@4361 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

widegraph.cpp

@@ -208,7 +208,7 @@ void WideGraph::keyPressEvent(QKeyEvent *e)
     emit f11f12(n);
     break;
   default:
-    e->ignore();
+    QDialog::keyPressEvent (e);
   }
 }