[VecOps] Make RAdoptAllocator<T> rebindable to RAdoptAllocator<bool>
[VecOps] Make RAdoptAllocator<T> rebindable to RAdoptAllocator<bool>

...and viceversa. Only non-adopting RAdoptAllocators can be rebound.
This makes it possible to copy-construct RVec<bool>'s from other
RVec<bool>'s.

karies/root,olifre/root,olifre/root,root-mirror/root,root-mirror/root,root-mirror/root,root-mirror/root,karies/root,karies/root,karies/root,karies/root,root-mirror/root,olifre/root,olifre/root,olifre/root,olifre/root,root-mirror/root,karies/root,olifre/root,karies/root,karies/root,root-mirror/root,karies/root,root-mirror/root,olifre/root,karies/root,root-mirror/root,olifre/root,root-mirror/root,karies/root,root-mirror/root,olifre/root,olifre/root