* ew-data.el:

* ew-data.el:
  - Abolish prev-token, next-token, start and end
  properties on fragment.
  - Abolish function `ew-tokenize-frag', `ew-add-open',
  `ew-add-close', `ew-add-token', `ew-add-close-token' and
  `ew-token-list'.
(ew-make-anchor): Add type property.
(ew-token-last-frag-p): New function.

* ew-parse.el: Add new token `anchor'.

* ew-scan-m.el: Use `ew-add-frag' instead of abolished
functions.

* ew-scan-s.el: Ditto.