[c++0x] <date_time> implementation, take 2

[Pedro Lamarão]

Here goes. The patch was generated with svn diff.

It defines get_system_time using std::time; we can add support for more 
precise stuff later.

Attached in a tarball is a testsuite for std::nanoseconds and 
std::system_time.

2008-03-10  Pedro Lamarão  <pedro.lamarao@gmail.com>

	* include/std/date_time: new file.
	* src/date_time.cpp: new file.
	* config/abi/pre/gnu.ver: get_system_time is a new symbol
	in version GLIBCXX_3.4.11.
	* include/Makefile.am: add date_time in std headers.
	* src/Makefile.am: add date_time.cc to source files.

--
  P.
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