* wesnoth-mode.el (wesnoth-indent-or-complete): Advise completion functions to

* wesnoth-mode.el (wesnoth-indent-or-complete): Advise completion functions to
  complete.
  (wesnoth-complete-macro, wesnoth-complete-attribute, wesnoth-complete-tag):
  Takes an optional argument to complete.  Fixed a bug where the last element
  would be inserted if point was nearby.
  (wesnoth-check-wml): Display message in echo-area when checking has
  started / stopped instead of in buffer.

* wesnoth-update.el (wesnoth-addition-file, wesnoth-update-output-directory):
  New customisation options.
  (wesnoth-files-in-dir): Fixed doc-string.
  (wesnoth-extract-tag-information): Fixed a bug where tags following #define
  would be incorrectly inserted.  Fixed a bug where tags needed to be used
  twice to be set correctly.
  (wesnoth-append-tag-information): Fixed a bug where tags needed to be used
  twice to be set correctly.
  (wesnoth-output-path): New function.
  (wesnoth-update-wml-additions): New command.
  (wesnoth-update): Use `wesnoth-output-path' and
  `wesnoth-update-wml-additions'.  Cleaned up error message and conditions for
  its use.  Updated docstring.

* wesnoth-wml-additions.cfg, wesnoth-wml-data.el: New files.