= Sleep = Every operating system has its own way sleep function. That is quite annoying and we haven't yet found a library that deals easily with it. So we simply defined the following functions for linux and windows: || sleep(unsigned long value) || Makes the current thread sleep for ''value'' seconds || || msleep(unsigned long value) || Makes the current thread sleep for ''value'' milliseconds || || usleep(unsigned long value) || Makes the current thread sleep for ''value'' microseconds ||