[rules-dev] Bug in Sudoku Example - with fix

Hi!

I found a bug in the rule 6,7 and 8 in the sudoku example:

It should not only test against the PCV but against the RCV too:

Rule 6:
# the not operator only causes this when clause to resolve to true when
there are not
# any other PCVs or RCVswith the same row and value as $possible
not (PossibleCellValue( row == $row, value == $value ) || ResolvedCellValue(
row == $row, value == $value) )

7 and 8 are similar.

juergen 
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