fix return values from SubToolChain Tool #6
Merged
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SubToolChain tool returns result of its ToolChain member for Initialise, Execute and Finalise.
But a Tool returns bool for its Init/Exe/Fin methods, whereas a ToolChain class returns an int for which 0 indicates success. So we need to invert the logic of return values from the ToolChain when returning them from the Tool.