* contrib/sly-stickers.el (sly-stickers-mouse-hover-face): Don't need this.
(sly-stickers-mode-map): Bind "C-c C-s S" to `sly-stickers--fetch'
(sly-stickers--stickers-between): New.
(sly-stickers--sticker): New button type.
(sly-stickers--set-face): New function.
(sly-stickers--sticker): Create a sticker button.
(sly-stickers--arm-sticker, sly-stickers--sticker-id)
(sly-stickers--disarm-sticker, sly-stickers--populate-sticker): Use buttons.
(sly-stickers--decrease-prio, sly-stickers--increase-prio): New
fucntions.
(sly-stickers--sticker-priority): New function.
(sly-stickers--delete): Improve to understand priorities.
(sly-stickers--sticker-modified): New hook.
(sly-stickers-operate-on-sticker): The "operate on existing
sticker" part is taken to the sticker's own keymap.
(sly-stickers-fetch): Don't warn too much.
(sly-stickers-commit-stickers): Ensure current package.
(sly-stickers-commit-stickers): Ensure a good sorting.