partly rewritten and extended.
(skeleton-filter, skeleton-untabify, skeleton-further-elements) (skeleton-abbrev-cleanup): New variables (skeleton-proxy, skeleton-abbrev-cleanup): New functions (skeleton-insert): Sublanguage element < must now be handled via `skeleton-further-elements' (used only in sh-script and ada). Lisp expressions can be quoted to ignore the return value. (skeleton-read): New name for `skeleton-internal-read' because this may be useful in skeletons. (local-variables-section): New skeleton command, might go to simple.el.
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