get_row_from_values

Returns the first row where all the values in values at the columns identified at cols_index match.

If the row can't be identified, then returns -1;

NOTE: the cols_index array MUST contain a column index for each value in values

Parameters:

this	a DataModel object.
values	a list of Value values (no null is allowed)
cols_index	an array of int containing the column number to match each value of values

Returns:

the requested row number, of -1 if not found