(newsticker-version): Changed to "1.10".

(newsticker-version): Changed to "1.10".
(newsticker--set-customvar): Doc string.
(newsticker-new-item-face): Doc string.
(newsticker-mode): Initialize `invisibility-spec' with t.
(newsticker-mode-map): Added `newsticker-mark-all-items-at-point-as-read'.
(newsticker-menu): Added narrow-to-item and narrow-to-feed.
(newsticker-w3m-show-inline-images): Do not call `w3m-remove-image'.
(newsticker--buffer-after-w3m-insert-image): New advice for
w3m-insert-image to cache images.
(newsticker-next-item-same-feed): New.
(newsticker-mark-all-items-at-point-as-read-and-redraw): New.
(newsticker-mark-all-items-of-feed-as-read): New.
(newsticker-mark-all-items-at-point-as-read): Use new functions.
(newsticker-mark-item-at-point-as-read): Doc string.
(newsticker-mark-item-at-point-as-read): Use new functions.
(newsticker--do-mark-item-at-point-as-read): New, extracted from
`newsticker-mark-item-at-point-as-read'.
(newsticker-hide-entry): Use (t) instead of t for invisibility.
(newsticker--sentinel): Yet another xml-parser workaround.
(newsticker--decode-iso8601-date): Bugfix for datestrings without days.
(newsticker--buffer-do-insert-text): Fix.
(newsticker--buffer-insert-enclosure): Fix. length might be missing.
(newsticker--buffer-make-item-completely-visible): `switch-to-buffer' not
necessary.