Pretty printers for versioned namespace

[François Dumont]

Hi

     Here is a patch to fix pretty printers when versioned namespace is 
activated.

     You will see that I have hesitated in making the fix independant of 
the version being used. In source files you will find (__7::)? patterns 
while in xmethods.py I chose (__\d+::)? making it ready for __8 and 
forward. Do you want to generalize one option ? If so which one ?

     At the moment version namespace is visible within gdb, it displays 
for instance 'std::__7::string'. I am pretty sure we could hide it, is 
it preferable ? I would need some time to do so as I am neither a python 
nor regex expert.

     I am not fully happy with the replication in printers.py of 
StdRbtreeIteratorPrinter and StdExpAnyPrinter(SingleObjContainerPrinter 
in respectively StdVersionedRbtreeIteratorPrinter and 
StdExpVerAnyPrinter(SingleObjContainerPrinter just to adapt 2 lines 
where regex is not an option. We could surely keep only one and pass it 
'' or '__7'. But as I said I am not a python expert so any help would be 
appreciated.

     I still need to run it with versioned namespace disabled to make 
sure there is no regression.

François

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