bastring.h: Move closer to the draft standard implementation of basic_string by addin...

bastring.h: Move closer to the draft standard implementation of basic_string by adding 3...

Sun Dec  7 02:34:40 1997  Jody Goldberg	<jodyg@idt.net>

	* libstdc++/std/bastring.h : Move closer to the draft standard
	implementation of basic_string by adding 3 paramter 'Allocator'.
	NOTE: this still differs from the standard in not offering per
	instance allocators.
	* libstdc++/std/bastring.cc : Likewise.
	* libstdc++/stlinst.cc : Handle thread safe allocators if they are the
	default.

From-SVN: r16993