We had a mix of 0.6.2 and 0.6.5 (which is the current release),
this unifies to the latest version. It also enables the union
feature which removes the discriminant, reducing memory usage.
* adds a hashglobe::alloc::realloc, as that was previously not implemented,
copying and simplifying from liballoc_system.
* routes malloc and realloc calls through hashglobe::alloc::, instead of
doing it via direct 'extern "C"' calls.
