Removed unused function declaration

Libs/XNAT/Core/ctkXnatFile.h

@@ -56,8 +56,6 @@ public:
   void setFileContent(const QString& fileContent);
   QString fileContent() const;
 
-  void download(const QString& filename);
-
   void upload(const QString& filename);
 
   void reset();

Libs/XNAT/Core/ctkXnatObject.h

@@ -128,6 +128,7 @@ public:
   void erase();
 
   void download(const QString&);
+
   /// Sends the object to the XNAT server
   /// Subclasses of ctkXnatObject can overwrite this function if needed
   virtual void commit();

Libs/XNAT/Core/ctkXnatResource.h

@@ -58,8 +58,6 @@ public:
 
   void reset();
 
-  void download(const QString& filename);
-
   void createFolder();
 
   static const QString ID;