Provide a dialog for band hopping scheduling which replaces tab
four. Ensure that split mode is not used for WSPR. Select the correct
tab for WSPR operation. Shift WSPR band hopping code out of the
MainWindow class.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@5517 ab8295b8-cf94-4d9e-aec4-7959e3be5d79