* images/README: Update with following information.

* images/README: Update with following information.

* images/data-save.xpm, images/mail/flag-for-followup.xpm:
* images/zoom-in.xpm, images/zoom-out.xpm: New images from GNOME 2.12.

* images/contact.pbm, images/data-save.pbm, images/delete.pbm:
* images/mail/flag-for-followup.pbm, images/mail/inbox.pbm:
* images/mail/move.pbm, images/next-page.pbm, images/zoom-out.pbm: New
bitmaps for new images.

* images/refresh.xpm, images/sort-ascending.xpm,
* images/sort-descending.xpm: Update with GTK 2.x images. Note that the
default GTK icons are not overridden by the GNOME theme due to a bug
which was fixed in GNOME 2.15. Once GNOME 2.16 is in wide circulation,
then the GTK icons should be replaced with the equivalent GNOME icons.
Until then, we should be consistent with GTK first, then GNOME.

* images/mail/repack.xpm, images/mail/reply-from.xpm:
* images/mail/reply-to.xpm, images/search-replace.xpm:
* images/separator.xpm, images/show.xpm: Update custom icons to be
closer to their GNOME counterparts.

* images/attach.pbm, images/exit.pbm, images/mail/compose.pbm:
* images/mail/repack.pbm, images/mail/reply-all.pbm:
* images/mail/reply-from.pbm, images/mail/reply-to.pbm:
* images/mail/reply.pbm, images/mail/send.pbm, images/show.pbm:
* images/search-replace.pbm: Update bitmaps.

* images/execute.pbm, images/execute.xpm, images/fld-open.pbm:
* images/fld-open.xpm, images/highlight.pbm, images/highlight.xpm:
* images/mail.pbm, images/mail.xpm, images/mail/alias.pbm:
* images/mail/alias.xpm, images/mail/refile.pbm:
* images/mail/refile.xpm, images/page-down.pbm, images/page-down.xpm:
* images/widen.pbm, images/widen.xpm: Remove custom MH-E icons since
MH-E is now using the equivalent GTK/GNOME icons.