[PATCH] Move rope, slist, hash_map, hash_set to __gnu_cxx

[Gabriel Dos Reis]

Paolo Carlini <pcarlini@unitus.it> writes:

| Hi,
| 
| this one moves such estensions (i.e., all those already present in include/ext
| before the recent addition of algorithm) to namespace __gnu_cxx. Tested
| i686-pc-linux-gnu (*).


Looks OK.


I'm deferring the issue of handling existing codes that assume
extensions are in std::.  I don't know whether whether simple
documentation is sufficient or if some compiler magic are
necessary. 

-- Gaby
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