Fixed errors caused by the last commit in the network module, and fixed minor warnings in the graphics module, on Linux

git-svn-id: https://sfml.svn.sourceforge.net/svnroot/sfml/branches/sfml2@1476 4e206d99-4929-0410-ac5d-dfc041789085

src/SFML/Graphics/Font.cpp

@@ -49,6 +49,7 @@ myCurrentSize(0)
 
 ////////////////////////////////////////////////////////////
 Font::Font(const Font& copy) :
+Resource<Font>(),
 myLibrary     (copy.myLibrary),
 myFace        (copy.myFace),
 myRefCount    (copy.myRefCount),

src/SFML/Graphics/Image.cpp

@@ -59,7 +59,8 @@ myPixelsFlipped (false)
 ////////////////////////////////////////////////////////////
 /// Copy constructor
 ////////////////////////////////////////////////////////////
-Image::Image(const Image& copy)
+Image::Image(const Image& copy) :
+Resource<Image>()
 {
     // First make sure that the source image is up-to-date
     copy.EnsureArrayUpdate();

src/SFML/Network/TcpSocket.cpp

@@ -31,6 +31,7 @@
 #include <SFML/Network/SocketImpl.hpp>
 #include <SFML/System/Err.hpp>
 #include <algorithm>
+#include <string.h>
 
 #ifdef _MSC_VER
     #pragma warning(disable : 4127) // "conditional expression is constant" generated by the FD_SET macro

src/SFML/Network/UdpSocket.cpp

@@ -31,6 +31,7 @@
 #include <SFML/Network/SocketImpl.hpp>
 #include <SFML/System/Err.hpp>
 #include <algorithm>
+#include <string.h>
 
 
 namespace sf