allocator.h (std::allocator): Base class is __allocator_base.

2012-03-19  Benjamin Kosnik  <bkoz@redhat.com>

	* include/bits/allocator.h (std::allocator): Base class is
	__allocator_base.
	(uses_allocator): Add to sub-grouping.
	* include/ext/new_allocator.h: Doxygen markup for tparm.

	* config/allocator/bitmap_allocator_base.h: Use __allocator_base
	template alias in C++11.
	* config/allocator/malloc_allocator_base.h: Same.
	* config/allocator/mt_allocator_base.h: Same.
	* config/allocator/new_allocator_base.h: Same.
	* config/allocator/pool_allocator_base.h: Same.

From-SVN: r185544