Reads the entire file (header, annotation, data).
[edf_file]=edfread_file(filename);
: string containing the path and name of the file
: struct containing all data.
edf_file.header - struct containing the header information.
edf_file.annotation - struct containing all annotations.
edf_file.data - data matrix
extract all signals data from a edf/bdf-file, if and only if each signal has the same sampling rate.