Feature/ref point replacement

[koraberisha]

As it says in the commit messages, not much changes!

[tomoqt]

since we also reproject optionally in the MLP, we also recalculate the reference point there.

there's a few ways to probably do this, since we could decide to just stay with the one we compute at the beginning and pass it around, or as currently we recompute it. probably makes more sense to actually pass it around, as in that situation (in lines 145-147) x is actually still not mapped back. in any case, probably it's cleaner to have a function that just does the reference point computation. also note, that in this case it's still leaking!