Implement console command to revoke rename token.

Fixes #826

- Introduce new field, status, in rename table (U-nused, A-pplied, R-evoked)
- Add methods to DW::RenameToken to revoke, test for revokedness
- Change implementation of ->apply and ->applied to use status
- Call ->revoked wherever needed (just about everywhere ->applied is called)
- New module DW::Console::Command::RevokeRenameToken implements console
  command revoke_rename_token