Plupload: switch to urlstream upload method when the 'flash' runtime is used in non IE browsers. This ensures cookies are sent but limits the maximum file size that flash can handle.

By default only IE9 and older use flash so this change is mostly for completeness. It would affect only the (extremely rare) cases where a plugin disables the html5 runtime.
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git-svn-id: http://core.svn.wordpress.org/trunk@27505 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Introduce a ms_site_not_found filter to replace NOBLOGREDIRECT.

Move some processing down below the point where we bail if there's no site. Add more documentation.

props jeremyfelt.
fixes #21143, see #27003.

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git-svn-id: http://core.svn.wordpress.org/trunk@27506 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Multisite load: Cache the main site lookup query.

props jeremyfelt.
see #27003.

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git-svn-id: http://core.svn.wordpress.org/trunk@27507 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Use wp_cache_add() instead of wp_cache_set() when we don't want an unconditional set.

props jeremyfelt.
see #27003.

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git-svn-id: http://core.svn.wordpress.org/trunk@27508 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Inline documentation for hooks in wp-includes/category-template.php.

Props kpdesign for the cleanup.
Fixes #27432.

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git-svn-id: http://core.svn.wordpress.org/trunk@27509 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Inline documentation for hooks in wp-admin/includes/post.php.

Also moves the primary PHPDoc for the `edit_posts_per_page` hook to wp-admin/includes/post.php.

Props kpdesign for some cleanup.
Fixes #27431.

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git-svn-id: http://core.svn.wordpress.org/trunk@27510 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Introduce HTML5 caption support.

When a theme supports HTML5 captions via add_theme_support( 'html5', 'caption' ), figure and figcaption will be used instead of div and p.

There's a bonus. But first, some history: Captions were introduced with an inline style set for the container. This remains, as it is there to force captions to wrap. But this inline style included an extra 10 pixels, which have vexxed theme developers for years. While these pixels were designed to ensure padding around floated images, modern themes handle this with grace. The additional pixels thus feel encumbering.

As the new HTML5 gallery support avoids outputting default gallery styles (again, irking theme developers for years; see #26697), the new HTML5 caption support will also ditch these 10 pixels of unwanted hand-holding. 

The 10 pixels are also removed entirely in the visual editor (and more styles may also disappear here; see #26642), giving themes the power necessary to match the frontend styles.

The filter img_caption_shortcode_width added in 3.7 to work around this madness (see #14380) is skipped entirely when the theme supports HTML5 captions.

props obenland, azaozz.
see #26642. also fixes #9066.

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git-svn-id: http://core.svn.wordpress.org/trunk@27511 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Inline documentation for hooks in wp-admin/includes/dashboard.php.

Props mauryaratan. Props kpdesign for some minor cleanup.
Fixes #25752.

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git-svn-id: http://core.svn.wordpress.org/trunk@27512 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Inline documentation for hooks in wp-admin/includes/menu.php.

Also fixes syntax for a few unrelated multi-line comments in the file.

Props kpdesign for some minor cleanup.
Fixes #27430.

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git-svn-id: http://core.svn.wordpress.org/trunk@27513 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove some debug cruft accidentally committed in [27670].

See #27430.

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git-svn-id: http://core.svn.wordpress.org/trunk@27514 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Inline documentation for hooks in wp-admin/includes/file.php.

Fixes #27429.

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git-svn-id: http://core.svn.wordpress.org/trunk@27515 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Inline documentation for wp-admin/includes/class-wp-upgrader.php.

Props kpdesign for some minor cleanup.
Fixes #27436.

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git-svn-id: http://core.svn.wordpress.org/trunk@27516 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Inline documentation for hooks in wp-admin/includes/taxonomy.php.

Props kpdesign for the initial patch.
Fixes #27433.

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git-svn-id: http://core.svn.wordpress.org/trunk@27517 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Use correct variable. see [27373].

props TobiasBg.
fixes #14424.

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git-svn-id: http://core.svn.wordpress.org/trunk@27518 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Inline documentation for hooks in wp-includes/post-template.php.

Props Toru and kpdesign.
Fixes #25621.

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git-svn-id: http://core.svn.wordpress.org/trunk@27519 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Plugin Installer: Disable 'Latest Version Installed' buttons.

props paulwilde.
see #26952.

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git-svn-id: http://core.svn.wordpress.org/trunk@27520 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Ensure Thickbox loading spinner is properly sized for HiDPI displays.

props paulwilde.
see #26952.

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git-svn-id: http://core.svn.wordpress.org/trunk@27521 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix typo in a comment. see #25663.
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