Revision 579001

2007-09-24 Travis Vitek <vitek@roguewave.com>

	STDCXX-492
	* string (operator+=): Replace call to append with push_back
	for performance.
	(append): Avoid calling replace() from append if there is
	sufficient buffer space available for performance.
	(append): Simplify append overload, move it to header and then
	inline it.
	(append): Use _RWSTD_SIZE_T to avoid integer overflow problems
	that could lead to heap corruption.
	(push_back): Call replace() instead of append when buffer
	reallocation required. cleanup. avoid integer overflow problem.
	* string.cc (append): Moved append overload to header and make
	it inline.