ENH: add method to clean internal applications

Modules/Wrappers/ApplicationEngine/include/otbWrapperCompositeApplication.h

@@ -84,6 +84,13 @@ protected:
    */
   bool AddApplication(std::string appType, std::string key, std::string desc);
 
+  /**
+   * Method to remove all internal applications. Application deriving from
+   * CompositeApplication should call this method at the begining of their
+   * DoInit().
+   */
+  void ClearApplications();
+
   /**
    * Connect two existing parameters together. The first parameter will point to
    * the second parameter.

Modules/Wrappers/ApplicationEngine/src/otbWrapperCompositeApplication.cxx

@@ -69,6 +69,13 @@ CompositeApplication
   return true;
 }
 
+void
+CompositeApplication
+::ClearApplications()
+{
+  m_AppContainer.clear();
+}
+
 bool
 CompositeApplication
 ::Connect(std::string fromKey, std::string toKey)