Move temporary directory creation and deletion outside of MainWindow

Changing configuration causes  WSJT-X and JTAlert to get  into a fight
for the temporary directory. By moving the creation and clearup of the
temporary directory outside  of the configurations loop  this issue is
minimized to no worse than before multiple configurations were added.

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6630 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

mainwindow.cpp

@@ -138,8 +138,8 @@ namespace
 }
 
 //--------------------------------------------------- MainWindow constructor
-MainWindow::MainWindow(bool multiple, MultiSettings * multi_settings,
-                       QSharedMemory *shdmem,
+MainWindow::MainWindow(QDir const& temp_directory, bool multiple,
+                       MultiSettings * multi_settings, QSharedMemory *shdmem,
                        unsigned downSampleFactor, QNetworkAccessManager * network_manager,
                        QWidget *parent) :
   QMainWindow(parent),
@@ -149,7 +149,7 @@ MainWindow::MainWindow(bool multiple, MultiSettings * multi_settings,
   m_multi_settings {multi_settings},
   m_settings {multi_settings->settings ()},
   ui(new Ui::MainWindow),
-  m_config {m_settings, this},
+  m_config {temp_directory, m_settings, this},
   m_WSPR_band_hopping {m_settings, &m_config, this},
   m_WSPR_tx_next {false},
   m_wideGraph (new WideGraph(m_settings)),