Detailed changes:
> 	Support for entry filters and buffer headers:
> 	* mship-edit.el (lp--add-entry-filter): New function.
> 	(lp--del-entry-filter): New function.
> 	(lp--apply-entry-filter): New function.
> 	(lp--entry-filter-description): New function.
> 	(lp--update-filter-description): New function.
> 	(lp--entry-filter-read): New function.
> 	(lp--entry-filter-passive): New function.
> 	(lp--entry-filter-hidden): New function.
> 	(lp--set-header): New function.
> 	(lp--create-buffer): Enable use of lp--set-header.
>
> 	Integrate mship-edit:
> 	* commands2.el (kom-membership): Removed old implementation and
> 	associated functions. Turned into an alias for kom-prioritize.
>
> 	* mship-edit.el (kom-prioritize): Renamed from
> 	kom-handle-membership.
>
> 	Improve membership edit:
> 	* mship-edit.el: Numerous minor changes. No details :-/
>
> 	* prioritize.el: Removed.
>
> 	* avltree.el: Removed.
>
> 	* elib-node.el: Removed.
>
> 	* clienttypes.el (read-list-delete-read-info): Update unreads in
> 	the membership buffer.
>
> 	* commands1.el (lyskom-add-member): Do replace-membership even
> 	when working under the session priority.
> 	(lyskom-add-member): Removed lp--update-buffer when adding a new
> 	membership or changing priority since lyskom-replace-membership
> 	will take care of that.
>
> 	* mship-edit.el (lp--print-entry): Recompute and obey visibility
> 	of entry. Erase entries that are invisible.
> 	(lp--erase-entry): Survive being called on an undrawn entry.
> 	(lp--entry-at): New implementation based on linear search that
> 	deals with invisible entries.
> 	(lp--maybe-update-unreads): Handle entry visibility and visibility
> 	changes correctly.
>