Fixed bugs 1174, 1213 and some problems I spotted on the way.

Detailed changes:
> 	Minor bug fixes:
> 	* commands2.el (kom-is-person-member-of-conference): When reading
> 	pers-to-check-mship-for, only read persons.
>
> 	* vars.el.in (lyskom-default-conference-strategy): Fixed typo in
> 	kom-move-text-tree.
>
> 	Fix bug 1174:
> 	* commands2.el (kom-join-all-conferences): Ask about receiving
> 	group messages in all conferences.
>
> 	* commands1.el (lyskom-add-member-answer): Added mship-type
> 	parameter.
> 	(lyskom-add-member-by-no): Added mship-type parameter.
> 	(kom-create-conf): Added mship-type parameter in call to
> 	lyskom-add-member-by-no
>
> 	Fix bug 1213:
> 	* commands1.el (lyskom-write-text): Handle argument correctly so
> 	both prefix arguments and menus work properly.
> 	(lyskom-add-member-answer): Added mship-type parameter
>