switch to lazy initialization of the api. this means os.loadAPI will no longer block if the api need to finish some business. it will only block on the first call to any api function - use lama.init() for a way to initialize the api without side-effects (this is done by the startup file generated by the api automatically, so you normally won't have to); name of the table used for keeping backups of the hijacked turtle api functions changed from __lama to _lama just in case, because stuff prefixed by two underscores is generally considered to be reserved for lua itself