- fix for issue 772

- fixed some issues in zstream that prevented to use "getline" in zipped streams 
- added a "pooled buffers" system to keep a cache of file descriptors. This is potentially dangerous though, but shaves several seconds of loading time on the PSP. If problems arise on other platforms I'll make it a compilation parameter
- gracefully fail when calling manacost information on a not properly initialized mana cost

projects/mtg/src/GameStateMenu.cpp

@@ -394,11 +394,9 @@ void GameStateMenu::listPrimitives()
     {
         string filename = "sets/primitives/";
         filename.append(primitiveFiles[i]);
-        izfstream file;
-        if (! JFileSystem::GetInstance()->openForRead(file, filename))
-            continue;
 
-        file.close();
+        if (! JFileSystem::GetInstance()->FileExists(filename))
+            continue;
         primitives.push_back(filename);
     }
     primitivesLoadCounter = 0;