Return 404 when querying author's posts who is not a member and has no posts on the site

fixes #20601. props yoavf, nacin, SergeyBiryukov, wonderboymusic, markjaquith.
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git-svn-id: http://core.svn.wordpress.org/trunk@27146 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add inline documentation for properties and other inline docs fixes for `WP_Adjacent_Post`.

See #26937.

Built from https://develop.svn.wordpress.org/trunk@27291


git-svn-id: http://core.svn.wordpress.org/trunk@27147 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove now-moot vanity spacing for `WP_Adjacent_Post` property definitions.

See #26937.

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git-svn-id: http://core.svn.wordpress.org/trunk@27148 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Document the `$taxonomy` property in `WP_Adjacent_Post`.

See #26937.

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git-svn-id: http://core.svn.wordpress.org/trunk@27149 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Introduce doing_filter() and doing_action() to identify hooks in progress.

did_action() returns true the moment a hook is initially run, leaving you no way to tell if the hook is still in progress. Hooks can be nested and this checks the entire stack, versus current_filter() which only identifies the final hook in the stack. This commit also introduces current_action() for parity.

To tell if a hook has completed, one can use did_action() and ! doing_action() together.

The functions do not require an argument. In that situation, they indicate whether the stack is empty.

props ericmann for the initial unit tests.
fixes #14994.

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git-svn-id: http://core.svn.wordpress.org/trunk@27150 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Set the taxonomy property in the WP_Adjacent_Post class. fixes #26937.

Built from https://develop.svn.wordpress.org/trunk@27296


git-svn-id: http://core.svn.wordpress.org/trunk@27151 1a063a9b-81f0-0310-95a4-ce76da25c4cd