Update mbpoll.c; Add CSV writing option #73
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Add support to write polled data into a CSV file. This implementation honors the format setting. The CSV file will have a header line generated containing the column names. Columns include the UTC timestamp in RFC3339 format as well as the device IDs and register numbers. For int16 values, the output differes from the console output: the columns are duplicated and both the signed and unsigned values are recorded in the CSV. This makes it easier to process the CSV on popular spreadsheet applications without having to do a bunch of nasty conversions.