for default_init_allocator, now use derivation from the inner allocator (that allocator still has to be 0-sized, though, since the rest of the code still assumes that) and an accessor inner() to get to that allocator.
for default_init_allocator, now use derivation from the inner
allocator (that allocator still has to be 0-sized, though, since
the rest of the code still assumes that) and an accessor
inner() to get to that allocator.

nliber/cool