* nnshimbun.el (nnshimbun-request-expire-articles): Use

* nnshimbun.el (nnshimbun-request-expire-articles): Use
 `nnshimbun-find-parameter'.
(nnshimbun-generate-nov-database): Bind a full group name while processing.
(nnshimbun-find-parameter): New implementation to refer to the nnshimbun group
 parameters.
(nnshimbun-index-range): Add a document that it's just a default.
(nnshimbun-pre-fetch-article): Ditto.
(nnshimbun-group-parameters): Specify a parameter type as `list'.
(TopLevel): Remove the local variable "-*- coding: junet; -*-".