* tools/gpg-wks-server.c (aCheck, oWithDir, oWithFile): New const.
(opts): New options --check, --with-dir, and --with-file.
(main): Call command_check_key.
(command_list_domains): Implement option --with-dir.
(fname_from_userid): New.
(command_check_key): New.
(command_remove_key): Implement existsing command.
(command_revoke_key): Call command_remove_key as a simple
implementation.