* ralloc.c (r_re_alloc): Instead of allocating a new bloc at the

* ralloc.c (r_re_alloc): Instead of allocating a new bloc at the
	end of the heap, copying the data to it, and then freeing the
	original bloc, just expand the original block.  This saves a copy
	and a call to sbrk, and also removes the large spike in memory
	allocation that would occur when resizing large buffers.  And it's
	less code.