Debug algorithms

[François Dumont]

Hi

     Here is eventually the so long promized patch to introduce Debug 
algos similarly to Debug containers.

     Why such an evolution:
- More flexibility, debug algos can be used explicitely without 
activating Debug mode.
- Performance: Debug algos can get rid of Debug layer on top of 
container iterators to invoke normal algos. Operations on normal 
iterators are faster and we also benefit from the same algos 
specialization that sometimes exist on some container iterators (like 
std::deque ones). Also normal algos are now using other normal algos, 
Debug check won't be done several times.
- It will be easier to implement new Debug checks without the limitation 
to do so through some Debug macro

     To do so I introduced a new namespace __cxx1998_a used for normal 
algos when Debug mode is active. I couldn't reuse __cxx1998 cause with 
current implementation of Debug containers __cxx1998 is exposed and 
because of ADL we could then have ambiguity between Debug and normal 
versions of the same algos. I also introduced a __std_a namespace which 
control the kind of algos used within the library mostly for containers 
implementation details.

     Patch is compressed as it is quite big.

     Tested under Linux x86_64 normal and debug modes.

François


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