* gnus-sum.el (gnus-highlight-selected-summary)

* gnus-sum.el (gnus-highlight-selected-summary)
(gnus-article-get-xrefs, gnus-summary-show-thread): Use
`gnus-point-at-bol' and `gnus-point-at-eol' instead of
`(progn (beginning-of-line) (point))'.  It's shorter, faster,
and makes it clear that we don't need the side effect.
* gnus-util.el (gnus-delete-line): do.
* gnus-xmas.el (gnus-group-add-icon): do.
* nnmail.el (nnmail-article-group, nnmail-cache-fetch-group): do.
* nntp.el (nntp-send-authinfo-from-file): do.
* nnml.el (nnml-header-value): do.
* nnheader.el (nnheader-insert-references): do.
* gnus-cite.el (gnus-article-highlight-citation)
(gnus-cite-parse): do.
* gnus-score.el (gnus-score-followup): do.
* gnus-draft.el (gnus-draft-send): do.
* gnus-group.el (gnus-group-highlight-line): do.
* gnus-cache.el (gnus-cache-braid-nov): do.
* nnfolder.el (nnfolder-retrieve-headers)
(nnfolder-request-article): do.
* gnus-art.el (article-hide-boring-headers)
(gnus-article-hide-header): do.

* nnheader.el (nnheader-find-nov-line): Use gnus-delete-line.
* nnml.el (nnml-request-replace-article): do.
* nnmbox.el (nnmbox-request-move-article, nnmbox-delete-mail): do.
* nnfolder.el (nnfolder-request-move-article): do.
* gnus-cache.el (gnus-cache-possibly-remove-article): do.
* gnus-art.el (gnus-mm-display-part): do.

* gnus-art.el (gnus-article-goto-part): Use gnus-goto-char.