Converter for CSV format

There is now a proper converter for importing from and exporting to CSV format. It supports reading the field names from the first row and writing the field names out to the first row of the file. It also suppoorts the escaping of double-quote characters, conditional double-quotes around fields, etc. The extension must be CSV. Only commas and decimal points are supported within the format. Some implementations use the localization values for these two items which makes the successful transfer of data from one localized version to another problematic.