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

messageaveraging.cpp

@@ -1,4 +1,5 @@
 #include "messageaveraging.h"
+
 #include <QSettings>
 #include <QApplication>
 #include <QTextCharFormat>
@@ -6,7 +7,6 @@
 #include "SettingsGroup.hpp"
 #include "qt_helpers.hpp"
 #include "ui_messageaveraging.h"
-#include "moc_messageaveraging.cpp"
 
 MessageAveraging::MessageAveraging(QSettings * settings, QFont const& font, QWidget *parent) :
   QWidget(parent),
@@ -23,7 +23,6 @@ MessageAveraging::MessageAveraging(QSettings * settings, QFont const& font, QWid
 MessageAveraging::~MessageAveraging()
 {
   if (isVisible ()) write_settings ();
-  delete ui;
 }
 
 void MessageAveraging::changeFont (QFont const& font)