Fix some implicit long-to-int cast warnings, appeared on OSX 64Bit with XCode and LLVM GGC
Fix wrong copy/paste
Replace C casts by C++ constructor wherever it's possible
Merge branch 'master' of https://github.com/christopho/solarus into warningPatch
Merge pull request #83 from vlag/warningPatch

Remove cast warnings on OSX with LLVM : first step