* Fix core pagination for "stable archives".
The current page will always be the current page,
regardless of archive sorting order. Page 76 of
86 pages will remain page 76, even if the archive
sorting is changed; it won't become page 10.
* Fix pagination for "stable archives" in themes.
Timeline and Bulletproof have pagination.
Both need to swap the prev/next links for
stable archives, as the sorting order has
been reversed.
* Fix prev/next page links for stable archives.
We shouldn't swap prev/next links for archive
pages. With stable archives, the title page is
the last page of the archive, not the first, so
all other pages are "previos", and we should
display it like that.
Cherry-picked from master.
Signed-off-by: Thomas Hochstein <thh@inter.net>