Opens an new file for writing.
[edf_handle]=edfopen_file_writeonly(path, filetype, number_of_signals)
string containing the path and name of the file
0 = EDFLIB_FILETYPE_EDFPLUS
1 = EDFLIB_FILETYPE_BDFPLUS
number_of_signals defines the number of signals that can be saved in the file
handle of the opened file
Opens an new file for writing. Warning, an already existing file with the same name will be silently overwritten without advance warning!
Returns a handle on success, you need this handle for the other functions. In case of an error, it returns a negative number . This function is required if you want to write a file..