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  m6_FiltInverse()

  Purpose:  This function reverses the state of every possible
            record number that could be set in the filter.  If
            the record is not set, then it is added to the filter,
            otherwise it is dropped.  For example, calling this function
            with a filter that contained only records for STATE="CA" would
            be every record where STATE!="CA".

   Syntax:  m6_FiltInverse( <nHandle1> ) )

    Where:  <nHandle1>     --  Is any valid handle to a filter.

  Returns:  Logical value:  .T. means the operation was successful,  .F.
            indicates it failed.  In the case of a .F. value call m6_Error()
            to retrieve the reason for the error.

  Example:

         #include "SIXCDX.CH"
         #include "MACHSIX.CH"

         //..............................................use customer file
         USE Customer via "SIXCDX"

         //...............................create RYO filter for STATE='CA'
         nHandle := m6_NewFilter( "State='CA'")

         //.........invert the result, creating a filter where STATE!='CA'
         m6_FiltInverse( nHandle )

         //............................................browse the results
         Browse()