fixed a bug in DipyDoc::read_mainfile__doctype_text__syntagma() : Dipydocs' notes seem to be correctly read
modified dipydoc/dipdydoc.* : added xmreader as Dipydoc's attribute
added Syntagma::pretty_debugmsg()
fixed a minor bug in DipyDoc::read_mainfile__doctype_text__syntagma()
Merge branch 'feature103' into dev
Fixed read_mainfile__doctype_text__syntagma() : the program reads now correctly the notes.