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

echograph.cpp

@@ -45,7 +45,6 @@ EchoGraph::EchoGraph(QSettings * settings, QWidget *parent) :
 EchoGraph::~EchoGraph()
 {
   saveSettings();
-  delete ui;
 }
 
 void EchoGraph::closeEvent (QCloseEvent * e)