Fix numerous memory leaks and uses of uninitialized variables

These were discovered when running under teh valgrind MemCheck tool. I
have also  checked in a suppressions  file (wsjtx-valgrind.linux.supp)
suitable for use on Linux when running the valgrind MemCheck tool.

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6755 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

TransceiverFactory.cpp

@@ -43,6 +43,11 @@ TransceiverFactory::TransceiverFactory ()
 #endif
 }
 
+TransceiverFactory::~TransceiverFactory ()
+{
+  HamlibTransceiver::unregister_transceivers ();
+}
+
 auto TransceiverFactory::supported_transceivers () const -> Transceivers const&
 {
   return transceivers_;