Inline documentation for hooks in wp-admin/network/site-settings.php.

Props admiralthrawn.
Fixes #25725.

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git-svn-id: http://core.svn.wordpress.org/trunk@25911 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Consolidate logic for not showing a taxonomy meta box. props ocean90. fixes #21543.

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Query stopwords: Only eliminate single A-Z letters as search terms.

Stop trying to match any single letters that are not East Asian characters, as this requires PCRE with UTF-8 support; and because it doesn't actually work.

fixes #25709.

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git-svn-id: http://core.svn.wordpress.org/trunk@25913 1a063a9b-81f0-0310-95a4-ce76da25c4cd
When an HTTPS request to api.wordpress.org fails, try an insecure HTTP request and issue a warning.

Certain versions of cURL appear to claim OpenSSL support but fail to work. We need to not trap users on older versions while we work this out, and instead fall back to an insecure request.

see #25716 for trunk.

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Add a $taxonomy argument to each of the adjacent post functions.

Each took an array of category (IDs) when to search. Those can now be term IDs and each function now has $taxonomy = 'category' as an optional argument.

Functions affected: get_previous_post(), get_next_post(), get_adjacent_post(), get_adjacent_post_rel_link(), adjacent_posts_rel_link(), next_post_rel_link(), prev_post_rel_link(), get_boundary_post(), get_previous_post_link(), previous_post_link(), get_next_post_link(), next_post_link(), get_adjacent_post_link(), adjacent_post_link().

props ethitter.
finally fixes #17807.

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