Rename charon script to nixops
Rename charon -> nixops in release.nix etc.
Rename Python package
Rename charon Nix expressions
Manual: Rename charon -> nixops
Rename Python classes charon.* to nixops.*
Rename charon-machine -> nixops-machines
Rename virtualbox-image-charon.nix -> virtualbox-image-nixops.nix
Automatically move ~/.charon to ~/.nixops
$CHARON_STATE -> $NIXOPS_STATE
$CHARON_DEPLOYMENT -> $NIXOPS_DEPLOYMENT
Rename the rollback profile to /nix/var/nix/profiles/per-user/<user>/nixops
Misc. renames