Eliminate the use of `extract()` in `wp_insert_post()`.

See #22400.

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git-svn-id: http://core.svn.wordpress.org/trunk@28296 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Eliminate the use of `extract()` in `wp_insert_attachment()`.

`wp_insert_attachment()` and `wp_insert_post()` are incredibly similar, but have branched logic. I have annotated many places where they diverge.

See #22400.

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git-svn-id: http://core.svn.wordpress.org/trunk@28297 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Eliminate the use of `extract()` in `get_pages()`.

See #22400.

Built from https://develop.svn.wordpress.org/trunk@28471


git-svn-id: http://core.svn.wordpress.org/trunk@28298 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Eliminate the use of `extract()` in `MO::import_from_reader()`.

See #22400.

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git-svn-id: http://core.svn.wordpress.org/trunk@28299 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Update help text on Add Themes screen.

props thomasvanderbeek.
fixes #28132.
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git-svn-id: http://core.svn.wordpress.org/trunk@28300 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add inline documentation for default arguments in `wp_insert_category()`.

See #28298.

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git-svn-id: http://core.svn.wordpress.org/trunk@28301 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix wp_insert_link(), broken in [28406]/[28408].

see #22400.
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git-svn-id: http://core.svn.wordpress.org/trunk@28302 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Improve inline documentation for default arguments in `wp_get_archives()`.

See #28298.

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git-svn-id: http://core.svn.wordpress.org/trunk@28303 1a063a9b-81f0-0310-95a4-ce76da25c4cd
The About page has a `<div>` that doesn't close. Also, `<hr>`s should self-close. `hackificator` complains about these things.

See #27881.

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git-svn-id: http://core.svn.wordpress.org/trunk@28304 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Because the `WP_ADMIN` constant name can be bound in multiple files, all instances should check `! defined` first. `wp-admin/admin.php` already has this check. 

See #27881.

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git-svn-id: http://core.svn.wordpress.org/trunk@28305 1a063a9b-81f0-0310-95a4-ce76da25c4cd
`hackificator` complains if you call `include 'file.php'` without the parens, needs to be `include( 'file.php' )`

See #27881.

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git-svn-id: http://core.svn.wordpress.org/trunk@28306 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Use proper access modifiers and add a magic `__get()` method to `Custom_Background` and `Custom_Image_Header`.

See #27881, #22234.

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git-svn-id: http://core.svn.wordpress.org/trunk@28307 1a063a9b-81f0-0310-95a4-ce76da25c4cd
`hackificator` bails on this file because the `<meta>` isn't self-closing.

See #27881.

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git-svn-id: http://core.svn.wordpress.org/trunk@28308 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove public keyword from some JS functions. Sorry.

Props ocean90.
See #22234.


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git-svn-id: http://core.svn.wordpress.org/trunk@28309 1a063a9b-81f0-0310-95a4-ce76da25c4cd
`hackificator` bails on this file because of mixed quote styles on some HTML attributes.

See #27881.

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git-svn-id: http://core.svn.wordpress.org/trunk@28310 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `edit-link-form.php`, `hackificator` bails because there is a `</form>` with no open `<form>`. It exists, but is needlessly constructed with PHP. It always returns a `<form>`, only the `id` and `name` are different. The dynamic piece just returns the ID now.

See #27881.

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git-svn-id: http://core.svn.wordpress.org/trunk@28311 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add access modifier (`public`) to members and methods in `WP_Comments_List_Table` and `WP_Post_Comments_List_Table`.

See #27881, #22234.

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git-svn-id: http://core.svn.wordpress.org/trunk@28312 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add access modifiers to members and methods in `WP_Filesystem_Base`. Add magic `__get()` method for backwards compatibility.

See #27881, #22234.

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git-svn-id: http://core.svn.wordpress.org/trunk@28313 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add access modifier (`public`) to methods in `WP_Filesystem_Direct`.

See #27881, #22234.

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git-svn-id: http://core.svn.wordpress.org/trunk@28314 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add access modifier (`public`) to members and methods in `WP_Filesystem_FTPext`.

See #27881, #22234.

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git-svn-id: http://core.svn.wordpress.org/trunk@28315 1a063a9b-81f0-0310-95a4-ce76da25c4cd