[c++0x] <date_time> implementation, take 4

[Pedro Lamarão]

Paolo Carlini escreveu:
> Hi Pedro,
>> Fixed function definitions to uglify local names.
>>
>> Fixed testsuite to use --std=gnu++0x instead of --std=c++0x.
> Excellent.
>> make check FAILs only abi_check.
> Mind, it should not! The only possible explanation is that you didn't 
> update lately the compiler proper...  (Honza fixed an inlining issue 
> which lead to spurious abi_check fails) Can you double check?
>
> Paolo.

I thought this test failed because of new symbols added.
My working copy is not up to date: Last Changed Rev: 133070
I'll test again with current HEAD.

--
 P.