Introduce a send_core_update_notification_email filter to control whether to send update notifications.

Currently, this is dependent on whether the automatic updater is enabled (generally). This is likely to be decoupled in a future release.

This refocuses the auto_core_update_send_email filter to specifically be for success/fail emails for auto updates, while the new filter is more general.

see #25603.

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About page, updates section: Don't show a message on about.php if the updater is 100% disabled. Don't show it if the user can't update core. Don't show the email if notifications are disabled. New string.

see #25603.

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About page: Cache our zxcvbn calls and limit the variation of the animation.

Diff is mostly whitespace.

props jorbin, azaozz.
fixes #25603.

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Avoid notice with search feeds.

fixes #25677.

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Remove debug code from WP_Automatic_Updater::send_email().

props markmcwilliams for initial patch.
see #25678.

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Confirm delete_site_option() exists before calling it during an update.

This function won't yet exist when updating from 2.7 [sic].

fixes #25682 for trunk.

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Always escape URLs at the last possible moment.

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Add editimage.min.js to $_old_files. see #24999.

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Maintain the same output for get_avatar() as 3.6. see [25895].

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Bundled themes: bump version numbers (ignoring Twenty Ten).
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Update POT files for Twenty Ten through Twenty Thirteen.

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Twenty Thirteen: Restore the original "Not found" string. see #24891, for trunk.

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Translator comments are special, make sure they are parsed properly. see #25256.

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POT update.

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Remove the old wp_auto_updates_maybe_update cron event. Schedule the new wp_maybe_auto_update event at 7 a.m. and 7 p.m. in the site's timezone.

see #27704.

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Inline documentation for hooks in wp-admin/customize.php.

Props andg, rzen.
Fixes #25444.

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Avoid a notice in is_main_network() when called in single site. see #25030.

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For Background updates, ensure that only one update process runs at the same time by using the options table as a lock.
This prevents multiple cron spawns and/or long-running updates from causing multiple update processes to spin up.
This also fixes a case where the upgrader might kick in for ( ! is_main_network() || ! is_main_site() ) in mulisite installs.
See #22704

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Inline documentation for hooks in wp-admin/options-discussion.php.

Props siobhyb, ericlewis.
Fixes #25453.

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Inline documentation for hooks in wp-admin/options-general.php.

Props siobhyb for the initial patch.
Fixes #25454.

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