Reading EDF(+) and BDF(+) Files

Reads European Data Format files EDF and EDF+, see < http://www.edfplus.info>, BioSemi Data Format files BDF, see < http://www.biosemi.com/faq/file_format.htm>, and BDF+ files, see < http://www.teuniz.net/edfbrowser/bdfplus%20format%20description.html>. The files are read in two steps: first the header is read and then the signals (using the header object as a parameter).