73 messages from other QSOs on frequency should now be ignored rather
than being processed.
Also some long overdue refactoring and tidying of non-idiomatic C++
code in the logbook directory.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@8047 ab8295b8-cf94-4d9e-aec4-7959e3be5d79