Add a filter for wp_list_comments() arguments.

props greenshady, hlashbrooke.
fixes #19581.
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git-svn-id: http://core.svn.wordpress.org/trunk@28113 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add context for 'Previous' and 'Next' theme strings.

see #28120, for trunk.
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git-svn-id: http://core.svn.wordpress.org/trunk@28114 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Use a consistent context to remove duplicate strings.

props pavelevap.
fixes #28123.
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git-svn-id: http://core.svn.wordpress.org/trunk@28115 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Translate a string added in 3.7 but never translated previously.

props andrezrv.
fixes #28025.
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git-svn-id: http://core.svn.wordpress.org/trunk@28116 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove unreachable `break` statements in `wp-admin/comments.php`. `break` is unnecessary after `die`, `exit`, and `wp_die`.

See #27882.

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git-svn-id: http://core.svn.wordpress.org/trunk@28117 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `wp-admin/custom-header.php`, `$default_color` is set twice before it is used. The first is unnecessary.

See #27882.

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git-svn-id: http://core.svn.wordpress.org/trunk@28118 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove unreachable `break` statements in `wp-admin/edit-tags.php`. `break` is unnecessary after `die`, `exit`, and `wp_die`.

See #27882.

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git-svn-id: http://core.svn.wordpress.org/trunk@28119 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `ajax-actions.php`, remove dead code:

* In `wp_ajax_add_tag()`, `$post_type` is set and never used.
* In `wp_ajax_hidden_columns()`, `$hidden` is set twice, but only checks for the existence of `$_POST['hidden']` the first time. The two lines can be combined and work together.
* In `wp_ajax_inline_save()`, `$mode` is set and never used.
* In `wp_ajax_find_posts()`, `$searchand = $search = '';` is leftover cruft, neither variable is used. `$wpdb` does not need to be imported, it is never used.
* In `wp_ajax_wp_fullscreen_save_post()`, `$post_type` is set and never used.
* In `wp_ajax_save_attachment_order()`, `$post` is set and never used.
* In `wp_ajax_send_attachment_to_editor()`, `$title` is set and never used. 

See #27882.

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git-svn-id: http://core.svn.wordpress.org/trunk@28120 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `WP_Media_List_Table`, remove dead code:

* In `->prepare_items()`, importing `$wpdb` is unnecessary.
* In `->get_columns()`, `$taxonomies` is set twice before it is used.
* In `->display_rows()`, `$taxonomy_object` is set and never used.

See #27882.


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git-svn-id: http://core.svn.wordpress.org/trunk@28121 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Custom Header: Fix logic when a theme doesn't set `default-text-color`.

fixes #28042.
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git-svn-id: http://core.svn.wordpress.org/trunk@28122 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `WP_MS_Users_List_Table::get_views()`, remove dead code:

* `$wp_roles` doesn't need to be imported.
* `$current_role` is set and never used.

See #27882.


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git-svn-id: http://core.svn.wordpress.org/trunk@28123 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `WP_Users_List_Table::get_views()`, `$current_role` is set and never used.

See #27882.


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git-svn-id: http://core.svn.wordpress.org/trunk@28124 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `get_media_item()`, `$tags` and `$_tags` are set and never used.

See #27882.

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git-svn-id: http://core.svn.wordpress.org/trunk@28125 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `attachment_submit_meta_box()`, remove dead code:

* `$action` doesn't need to be imported.
* `$can_publish` is set and never used, which means it doesn't need...
* `$post_type_object` or `$post_type`, which only served `$can_publish`.

See #27882.

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git-svn-id: http://core.svn.wordpress.org/trunk@28126 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `update_option_new_admin_email()`, `$email` is set and never used.

See #27882.


Built from https://develop.svn.wordpress.org/trunk@28299


git-svn-id: http://core.svn.wordpress.org/trunk@28127 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `wp-admin/includes/nav-menu.php`, remove dead code:

* In `_wp_ajax_menu_quick_search()`, in an `else` block, `$post_obj` was set and not used. Another block sets it again and does use it. 
* In `wp_nav_menu_item_post_type_meta_box()`, `$post_type_object` was set and, sadly, never used. `$error` was set and not used. 

See #27882.


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git-svn-id: http://core.svn.wordpress.org/trunk@28128 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `install_plugin_information()`, `$title` is set in a `foreach` loop and never used. This appears to be due to copy-pasting a previous `foreach` loop and not discarding these bits.

See #27882.


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git-svn-id: http://core.svn.wordpress.org/trunk@28129 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `get_sample_permalink_html()`, `$view_link` is set and never used.

See #27882.


Built from https://develop.svn.wordpress.org/trunk@28302


git-svn-id: http://core.svn.wordpress.org/trunk@28130 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `WP_Screen::render_screen_options()`, remove dead code:

* `$wp_list_table` does not need to be imported.
* `$post` is set and never used.

See #27882.

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git-svn-id: http://core.svn.wordpress.org/trunk@28131 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `wp-admin/includes/update.php`, remove dead code:

* In `get_core_checksums()`, `$return` is set and never used.
* In `core_update_footer()`, `break` is unnecessary and unreachable after `return`.
* In `get_theme_updates()`, `$themes` is set and never used.
* In `wp_theme_update_row()`, `$theme_name` is the only user of `$themes_allowedtags`... neither are used. 	

See #27882.

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git-svn-id: http://core.svn.wordpress.org/trunk@28132 1a063a9b-81f0-0310-95a4-ce76da25c4cd