adding :
void* invalidate(void* data);//main.cpp
void* broadcastModif(void* data);//main.cpp
std::string getFileVersion(int index);//Peer
bool haveWrongFileVersion(File file);//Peer
bool sameFileButDifferentVersion(File file);//File
Modif :
handleQueryClient(void* data), client(void* data), getCmd(Query &query, const std::string myCout)
std::string modifyFile(std::string fileName)