Replace distributing factories with new_<T[]>(...)

[hkaiser]

The existing distributing factories are cumbersome (and obsolete). We should replace them with

hpx::future<std::vector<id_type> > v = hpx::new_<Component[]>(...);

were the placement of the newly created components should be customizable with a distribution policy. We should also extend the existing new_<Compoent>() (for creating a single instance) with a similar placement policy.

[hkaiser]

This snippet demonstrates a technique for how this could be implemented: https://ideone.com/jN78LQ

[hkaiser]

This has been fixed by merging #1456