Discuss registers / killring-style system

[ElKowar]

I'd think we want to have a vim-style concept of different registers, maybe a killring of deleted text. However, especially w.r.t. a kill-ring, I'd think that may already be the concern of a vim plugin rather than of core, although I'm not sure.
Having some concept of registers should most likely be part of core, however. The details of this need to be discussed