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dfNullify()
Sets a given field to NULL
------------------------------------------------------------------------------
Syntax:

     dfNullify( <cField> ) --> NIL

Parameters:

     <cField>   Field to nullfy.

Returns:

     NIL

Description:

     Sets a given field to NULL, based on its type. This operation works in
     the current area and assume that the record is locked. The following
     field types can be handled:
     +------------------------------------------------+
     |  Type  |  Description  | Null value            |
     |--------+---------------+-----------------------|
     |   C    |  Character    | CHR(177)              |
     |   D    |  Date         | "01/01/80"            |
     |   L    |  Logic        | .F.                   |
     |   N    |  Numeric      | -1                    |
     +------------------------------------------------+

Example:

     // Cli->CodCli is "00001"
     Cli->(dfNullify( "codcli" )) // Nullfies the field

See also:

     dfKeyEmpty()