Fix the layout of the Image Details modal, props gcorne, see #24716 [28682]
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In `wp_insert_term()`, when no slug is provided, check for an existing term by name. If it exists, use that slug instead of calling `sanitize_title( $name )`.

Prevents creating an endless number of terms like `A+` or `$$$$` in any given taxonomy.

Props wonderboymusic, SergeyBiryukov, aaroncampbell.
Fixes #17689.

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Don't use a variable variable in `wp_widget_rss_form()`. Sidenote: the logic to show hidden fields is bizarre - would result in duplicate fields.

See #27881.

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Improve inline documention for `set_transient()` and `set_site_transient()` to specify the 45- and 40-character limits for their respective transient name values.

Props edwin-at-studiojoyo.com for the original patch.
See #15058, #13310. Fixes #28467.

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Don't use variable variables in `get_terms()`.

See #27881.

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Don't use variable variables in `WP_Query::get_posts()`.

See #27881.

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Don't use variable variables in `WP_Comment_Query::query()`.

See #27881.

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Don't use variable variables in `plugins_url()`.

See #27881.

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Don't use variable variables in `wp_insert_user()`. 
Add a local array, `$meta`, to provide substantial disambiguation among variables. 

See #27881.

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Don't use variable variables in `wp_salt()`.

See #27881.

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Don't use variable variables in `wp_dashboard_plugins_output()`. Variable variables aren't the worst thing about this function.

See #27881.

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OPML:
* Learn how OPML works, cry.
* Remove unused globals in `startElement()`
* Stop using variable variables in `startElement()`

Tested with the OPML importer plugin

See #27881.

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Don't use variable variables in `setup-config.php` (Step 2).
See #27881.

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Don't use variable variables in `user-new.php`. Test by causing errors when creating a new user.

See #27881.

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Don't use variable variables in `wp_reset_vars()`. Test by searching in list tables, etc.

See #27881.

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Don't use variable variables in `touch_time()`. 
See #27881.

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