unordered insert hint patch

[François Dumont]

Hi

     IMO the debug mode code should only take care about making debug 
checks and then move all info to the normal code. This is why I propose 
this patch that check and pass the hint iterator passed to some 
unordered insert overloads and that the debug hide to the normal code 
for the moment. This is a maintenability patch so that the day the 
normal code use the hint iterator the debug code won't have to be impacted.

François

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