The bulk editor and post format meta box should use the same checks for available post formats.

Props eightface.
Fixes #27187.


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Twenty Thirteen and Fourteen: implement HTML5 markup for galleries (see #26697) and captions (see #26642). Props obenland, closes #27502.
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Add the 'attachment_' prefix to caption IDs after editing, see #24409
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Better, more consistent styling for plugin details Thickbox and TinyMCE help.

props avryl. fixes #26952.

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