Add nginx detection to the Permalink Settings screen.

Introduces got_url_rewrite() and a corresponding filter, which should now be used in lieu of the got_rewrite filter in got_mod_rewrite().

This does not write or even suggest nginx configuration; rather, it prevents nginx from being considered as either Apache or as an unrecognized server.

props johnbillion.
fixes #25098.

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Clarify a string in Network Dashboard help text. props DrewAPicture. see #23163.
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Update inline documentation for l10n functions. props CharlesClarkson, DrewAPicture. fixes #16750.
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Only focus the title field when it is empty. Remove ancient code that provided for an alternate condition.

props scruffian for initial patches.
props helen.
fixes #24423.

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Allow the value attribute for list items processed by kses.

props kraftbj.
fixes #24293.

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Check if the post type supports title. see #24423.
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