The menu items for `users.php` and `profile.php` that require the `promote_users` cap should be wrapped in an `is_multisite()` conditional a la `user-new.php`.

Props SergeyBiryukov.
Fixes #30526.

Built from https://develop.svn.wordpress.org/trunk@30659


git-svn-id: http://core.svn.wordpress.org/trunk@30649 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Use `round()` instead of `floor()` when resizing image dimensions.

Updates unit tests.

Props SergeyBiryukov, kitchin.
Fixes #18532.

Built from https://develop.svn.wordpress.org/trunk@30660


git-svn-id: http://core.svn.wordpress.org/trunk@30650 1a063a9b-81f0-0310-95a4-ce76da25c4cd