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  Sx_VSigLen():

  Syntax:   Sx_VSigLen( <nField> | <cField> )

            nFldNum = Number of the field being evaluated.
            cFldNum = Name of the field being evaluated.

  Returns:  In the case of weakly-typed "V" fields, returns the number of
            significant bytes in the specified field.  For strongly-typed
            "V" fields and all other standard Clipper field types, returns
            the same value as Clipper's LEN() function (the width of the
            field itself).

            If a workarea is not in use, or an invalid parameter value is
            passed, zero is returned.

  Description:  See return value above.

  Example:  // Assume the 3th field (STREET) has 5 significant bytes
            USE test EXCL
            ? Sx_VSigLen( 3 )           // Returns 5
            ? Sx_VSigLen( "STREET" )    // Returns 5