Setup major reshuffle: split up in pre-auth: backend & user creation, and

Setup major reshuffle: split up in pre-auth: backend & user creation, and
the rest in post-auth (after user is logged in).
This because:
1) It is safer, the process without a user configured is kept short
2) Easier for the user, so they can have the first step go well,
   even if they are stuck at the post-auth step (RPC).

This is even more important if we would later expand the setup step
with more questions/options/etc.

This ALSO mutilates Valware's magnificient on both JS and the dialogs ;P