Type cast `$nonce` to string in `wp_verify_nonce()`.

props jesin.
fixes #29542.
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git-svn-id: http://core.svn.wordpress.org/trunk@30566 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove the `wp_is_trusted_network()` function pending further discussion on terminology and behaviour.

See #30145

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git-svn-id: http://core.svn.wordpress.org/trunk@30567 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Network Admin: Improve width of input fields on Add New Site and Edit Site screens.

props honeysilvas.
fixes #16383.
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git-svn-id: http://core.svn.wordpress.org/trunk@30568 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Comments: Use proper HTTP response codes for validation errors.

props miqrogroove, solarissmoke, mackensen.
fixes #11286.
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git-svn-id: http://core.svn.wordpress.org/trunk@30569 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix DocBlock formatting for `wp_generate_password()`.

Props stevegrunwell for the initial patch.
Fixes #30509.

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git-svn-id: http://core.svn.wordpress.org/trunk@30570 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove unbounded check for "install.php" in `wp_not_installed()`.

The check is true for `wp-admin/plugin-install.php` and `wp-admin/theme-install.php` too. This will end in a redirect to `/wp-admin/upgrade.php` or a screen with a bunch of errors.
The `WP_INSTALLING` constant was added in WordPress 1.5.1 to `wp-admin/install.php` which makes the check for "install.php" redundant.

props joemcgill.
fixes #29694.
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git-svn-id: http://core.svn.wordpress.org/trunk@30571 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove old DFW width adjustment help text.

fixes #30517
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git-svn-id: http://core.svn.wordpress.org/trunk@30572 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Editor: fix warnings in class-wp-editor.php, see #30453.
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git-svn-id: http://core.svn.wordpress.org/trunk@30573 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove unused CSS and JS from wp-mce-help.php, see #30517.
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