This function sets all MIDAS configuration variables to default values and prepares MIDAS for use. It must be called before any other MIDAS function, including MIDASinit and MIDASsetOption, is called. After this function has been called, MIDASclose can be safely called at any point and any number of times, regardless of whether MIDAS has been initialized or not. After calling this function, you can use MIDASsetOption to change MIDAS configuration before initializing MIDAS with MIDASinit.