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

See #22400.

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git-svn-id: http://core.svn.wordpress.org/trunk@28291 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Eliminate the use of `extract()` in `get_terms()`.

See #22400.

Built from https://develop.svn.wordpress.org/trunk@28465


git-svn-id: http://core.svn.wordpress.org/trunk@28292 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Eliminate the use of `extract()` in `wp_delete_term()`.

See #22400.

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git-svn-id: http://core.svn.wordpress.org/trunk@28293 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Restore `$soucrce` in `WP_Upgrader::install_package()`.

See #22400.

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git-svn-id: http://core.svn.wordpress.org/trunk@28294 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add inline comment after fix in [28467].

Props jesin.
Fixes #28292.


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git-svn-id: http://core.svn.wordpress.org/trunk@28295 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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