Add a warning for the user when running --list without arguments: not all tests are listed, only those enabled by default (e.g. FTPTestCase doesn't appear there)!
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64460 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775