TTSD-21265

There is a new possibility to use separators in the .dat files for the fVF reference function.

• The fVF reference function can now use a preferred column separator of choice. Previously, it was possible to use only spaces as separators.
• You can use only a single character as a separator. For example, you cannot use a more complex separator such as "/+/", because only the first character would be considered as a column separator.
• The .dat file lines do not need to end with a space or separator anymore to retrieve the last element of the column.
• Columns can now include blank values if the separator is different than the default space separator. For example: =fVF(dat,2,2,"/")

With a data row of 2 / / NG / / 2.5 / / 50 60 50 25/ returns nothing (the empty string when mapped to text).