Discover parameter: time_header_coord

[abenassi]

• Time header coordinate could be searched with approximate string matching if time_header is provided.
• If time header is not provided, an approximate string matching search could be performed against a dictionary of well-known ways to express the name of a time values index in different languages (like "Date", "Time", "Fecha", "Datum", etc.)
• If no certain time header can be found, the time header would be the cell right above the first time value in a time value index.