Merge changes made in Gnus trunk.

Merge changes made in Gnus trunk.

2012-01-06  Lars Magne Ingebrigtsen  <larsi@gnus.org>
  * gnus.texi (Group Parameters): Really note precedence.
2012-01-07  Lars Magne Ingebrigtsen  <larsi@gnus.org>
  * mm-decode.el (mm-interactively-view-part): Use `completing-read',
  since ido doesn't work on symbols (bug#9632).
  * gnus.el (gnus-group-fast-parameter): Use the same precedence rules
  when getting a single value as when getting all the values.  This means
  that atoms like `gcc-self' work cumulatively, like variable settings,
  instead of getting the value from the last matching clause.
  (gnus-group-find-parameter): Protect against the group buffer not
  existing (bug#9585).
2012-01-06  Lars Magne Ingebrigtsen  <larsi@gnus.org>
  * gnus-start.el (gnus-activate-group): Document more parameters
  (bug#9694).
  * gnus-group.el (gnus-group-read-ephemeral-group): Doc clarification
  (bug#9692).
  * gnus-agent.el (gnus-agent-store-article): Tell the Agent when the
  article was fetched, so that it can be expired later (bug#9958).
  (gnus-agent-summary-fetch-series): Add doc string.
  (gnus-agent-summary-fetch-group): Don't remove tick and dormant marks
  (bug#9517).
  * nntp.el (nntp-retrieve-groups): Refuse to do retrieval when an async
  retrieval is happening.
  * gnus.el (gnus-parameters): Doc fix.
2012-01-06  Dave Abrahams  <dave@boostpro.com>  (tiny change)
  * gnus-sum.el (gnus-summary-refer-thread): If the subtree is hidden,
  show the thread after expansion.
2012-01-06  Lars Magne Ingebrigtsen  <larsi@gnus.org>
  * gnus-art.el (article-narrow-to-head): If the head is completely
  empty, narrow to the empty region (bug#9764).
  * gnus-sum.el (gnus-summary-mark-article-as-unread): Mark articles as
  read, and then mark them as unread only when the unread mark is used.
  This makes `C-- T k' actually work, even though it's confusing.
  * gnus-win.el (gnus-all-windows-visible-p): Ensure that the buffer is
  alive before we try to find its window.
2012-01-06  Brian Sniffen  <bsniffen@akamai.com>  (tiny change)
  * mm-decode.el (mm-display-external): Use a longer timeout for the
  deletion to allow slow programs to display the file.
2012-01-06  Lars Magne Ingebrigtsen  <larsi@gnus.org>
  * gnus-art.el (gnus-article-browse-delete-temp-files): Fix up the
  prompt to be less confusing.