rope (_Rope_rep_alloc_base): Eliminate.

2004-01-13  Paolo Carlini  <pcarlini@suse.de>

	* include/ext/rope (_Rope_rep_alloc_base): Eliminate.
	(_Rope_rep_base): Inherit directly from the rope allocator;
	use rebinding instead of _Alloc_traits; pick up data member
	from _Rope_rep_alloc_base.
	(_Rope_alloc_base): Eliminate.
	(_Rope_base): Inherit directly from the rope allocator; use
	rebinding instead of _Alloc_traits; pick up data member from
	_Rope_alloc_base.
	(rope::_S_new_RopeLeaf, rope::_S_new_RopeConcatenation,
	rope::_S_new_RopeFunction, rope::_S_new_RopeSubstring): Tweak.

From-SVN: r75800