Fix the segfault when going to the network or the kart selection screen after going to the addons menu

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@5924 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/addons/addons.cpp

@@ -33,6 +33,7 @@
 #include "io/file_manager.hpp"
 
 #include "karts/kart_properties_manager.hpp"
+#include "states_screens/kart_selection.hpp"
 
 using namespace irr; /* irrXML which is used to read (not write) xml file,
 is located in the namespace irr::io.*/
@@ -378,8 +379,7 @@ void Addons::SaveInstalled()
     }
     xml_installed << "</addons>" << std::endl;
     xml_installed.close();
-    kart_properties_manager->unloadAllKarts();
-    kart_properties_manager->loadAllKarts();
+    kart_properties_manager->reLoadAllKarts();
 }
 // ----------------------------------------------------------------------------
 void Addons::UnInstall()

src/karts/kart_properties_manager.cpp

@@ -83,6 +83,22 @@ void KartPropertiesManager::unloadAllKarts()
     m_kart_search_path.clear();
 }   // removeTextures
 
+//-----------------------------------------------------------------------------
+void KartPropertiesManager::reLoadAllKarts()
+{
+    for(KartPropertiesVector::iterator i  = m_karts_properties.begin();
+        i != m_karts_properties.end(); ++i)
+    {
+        delete *i;
+    }
+    m_karts_properties.clear();
+    m_selected_karts.clear();
+    m_kart_available.clear();
+    m_groups.clear();
+    m_all_groups.clear();
+    //m_kart_search_path.clear();
+	loadAllKarts();
+}  
 //-----------------------------------------------------------------------------
 /** Loads all kart properties and models.
  */

src/karts/kart_properties_manager.hpp

@@ -66,6 +66,7 @@ public:
     
     void                     loadAllKarts           ();
     void                     unloadAllKarts         ();
+	void					 reLoadAllKarts			();
 
     const unsigned int       getNumberOfKarts       () const {return (unsigned int)m_karts_properties.size();}
     const std::vector<std::string>&