Updates/improvements -- riece-xfaceb

Updates/improvements -- riece-xfaceb

This changeset improves the speed of the bbdb lookups as much as possible,
and also makes it possible for the user to choose which channels this
addon will be active in.

	* lisp/riece-xfaceb.el: Autoload #'bbdb-search.

	* lisp/riece-xfaceb.el (riece-xfaceb-channels): New customisable
	variable.  Holds list of channels where this addon should be
	active.

	* lisp/riece-xfaceb.el (riece-xfaceb-addremove-channel): New
	convenience user function to update `riece-xfaceb-channels'.

	* lisp/riece-xfaceb.el (riece-xfaceb-add-glyph): New.  Adds either
	a cface or xface glyph to an extent.

	* lisp/riece-xfaceb.el (riece-xfaceb-update-user-list-buffer):
	Only update in channels listed in `riece-xfaceb-channels' (all
	chans if that is nil).
	Use #'bbdb-search to search specifically on ircnick field instead
	of crawling the entire db.
	Use #'riece-xfaceb-add-glyph.

	* lisp/riece-xfaceb.el (riece-xfaceb-enable): Add
	`riece-xfaceb-channels' to `riece-saved-forms'.
	Define `C-c C-c x' to #'riece-xfaceb-addremove-channel.

	* lisp/riece-xfaceb.el (riece-xfaceb-disable): Remove
	`riece-xfaceb-channels' from `riece-saved-forms'.
	Undefine `C-c C-c x'.

Signed-off-by: Steve Youngs <steve@sxemacs.org>