Added a reference csv file of walking data. Currently, this is just 512 data elements (4 seconds of data at 128 Hz) copied directly from the original data file for development purposes only. Added c++ file to read the reference signal.
Added new files specific to the ANN.
Moved file input/output functions to their own namespace (fio)
Updated the MLP to display the error as the normalized sum of squares of the ANN output from the target output.