Details of --config command line option. Note that low confidence
decodes '?' are not spotted and more generic text for --help command
line option now derived from CMakeLists description strings.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@8005 ab8295b8-cf94-4d9e-aec4-7959e3be5d79