Add back vwv ability to read local pf:/// urls

The users will get a nasty fault however when they try to use a pf url
that is not local. There is no easy way to test if the hostname is
local or not. They are probably some other libraries which might help
solve that.

src/vw/gui/TileGenerator.cc

@@ -101,6 +101,9 @@ boost::shared_ptr<TileGenerator> TileGenerator::create(std::string filename_) {
         return boost::shared_ptr<TileGenerator>( new TestPatternTileGenerator(256) );
       else
         return boost::shared_ptr<TileGenerator>( new ImageTileGenerator(u.path()) );
+    } else if (u.scheme() == "pf" && fs::extension(u.path()) == ".plate") {
+      std::cout << "Loading: " << u.path() << "\n";
+      return boost::shared_ptr<TileGenerator>( new PlatefileTileGenerator(u.string()) );
     } else {
       std::cerr << "Could not open " << u << ":\n\t" << "No handler for url scheme " << u.scheme() << std::endl;
     }