debug shrink_to_fit

[François Dumont]

Hi

     I noticed that containers having the shrink_to_fit method had no 
debug implementation of this method leaving iterators potentially 
invalidated by a shrink_to_fit call undetected:

2011-06-07  François Dumont <francois.cppdevs@free.fr>

         * include/debug/vector, deque, string: Add shrink_to_fit debug
         implementation.
         * testsuite/23_containers/vector/debug/shrink_to_fit.cc: New.
         * testsuite/23_containers/deque/debug/shrink_to_fit.cc: New.
         * testsuite/21_string/debug/shrink_to_fit.cc: New.

Ok to commit ?

Regards

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