* riece-globals.el (riece-obarray-size, riece-obarray): Abolish.

(riece-channel-obarray-size, riece-user-obarray-size)
(riece-channel-obaary, riece-user-obarray): New variables.
* riece-user.el (riece-find-user, riece-forget-user)
(riece-rename-user, riece-get-user): Use `riece-user-obarray'
instead of `riece-user-obarray'.
* riece-channel.el (riece-find-channel, riece-forget-channel)
(riece-get-channel): Use `riece-channel-obarray' instead of
`riece-obarray'.
* riece-misc.el (riece-get-identities-on-server): Ditto.
* riece-server.el (riece-reset-process-buffer): Ditto.