[c++0x] <date_time> implementation

[Pedro Lamarão]

Here is the start of an implementation of <date_time>.

It has the elements I found necessary to implement <thread>, <mutex>
and <condition_variable> -- basically, system_time and bits of
nanoseconds.

I'm not sure about the implementation of get_system_time -- is
clock_gettime acceptable? I'm not very familiar with these interfaces.

2008-03-03  Pedro Lamarão  <pedro.lamarao@gmail.com>

	* include/std/date_time: new file.
	* src/date_time.cpp: new file.

-- 
 Pedro Lamarão

 "The True Self is the meaning of the True Will:
   know thyself through Thy Way."
                                        -- The Book of Thoth
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