Menu action to open the log directory

Since the log files have moved to  a hidden directory a menu action to
open the logs directory in a suitable system applicaiton is needed.

Added "Open log directory" to File manu bar pop up menu.

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx-1.4@4470 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

mainwindow.cpp

@@ -9,6 +9,9 @@
 #include <QLineEdit>
 #include <QRegExpValidator>
 #include <QRegExp>
+#include <QDesktopServices>
+#include <QUrl>
+#include <QDir>
 #include <QDebug>
 #include <QtConcurrent/QtConcurrentRun>
 
@@ -2493,6 +2496,11 @@ void MainWindow::on_actionErase_wsjtx_log_adi_triggered()
   }
 }
 
+void MainWindow::on_actionOpen_log_directory_triggered ()
+{
+  QDesktopServices::openUrl (QUrl::fromLocalFile (m_config.data_path ().absolutePath ()));
+}
+
 bool MainWindow::gridOK(QString g)
 {
   bool b=g.mid(0,1).compare("A")>=0 and