Discover parameter: headers_coord

[abenassi]

• Headers coordinates could be discovered just having data_starts parameter and looking up to the first string that is not an empty or None value. There should be a way to look for new series (consecutive sequences of float values?) to find new headers up to the end of the file (end of spreadsheet dimension or starting only blank cells from the end point).
• If a series_names parameter is given, first rows/columns could be searched for strings approximately matching any of the series_names provided. Only headers coordinates for names provided would be taken, so this option would act also as a filter to get some of the series but not all.