Writes an annotation/event to the file
edfwrite_annotation_latin1(edf_handle, onset, duration, description)
integer containing file handle of the opened bdf/edf-file
onset is relative to the starttime and startdate of the file in units of Seconds! resolution is 0.0001 second! .
duration are in units of Seconds! resolution is 0.0001 second! If duration is unknown or not applicable: set a negative number (-1)
Latin1-string containing the text that describes the event.
Writes an annotation/event to the file. This function is optional and can be called only after opening a file in writemode and before closing the file