Network Admin toolbar menu: Add Plugins and Themes, remove Visit Network.

props Ipstenu, SergeyBiryukov.
fixes #21674.


Built from https://develop.svn.wordpress.org/trunk@25120


git-svn-id: http://core.svn.wordpress.org/trunk@25100 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid an undefined index notice when submitting a comment with JavaScript disabled. fixes #24752.
Built from https://develop.svn.wordpress.org/trunk@25121


git-svn-id: http://core.svn.wordpress.org/trunk@25101 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Don't show the "Get Shortlink" button for pages with a ?page_id=x permalink.

Props sillybean
fixes #14760

Built from https://develop.svn.wordpress.org/trunk@25122


git-svn-id: http://core.svn.wordpress.org/trunk@25102 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add 'taxonomy_parent_dropdown_args' filter for the parent dropdown on taxonomy term editing screens. props leewillis77. fixes #18166.
Built from https://develop.svn.wordpress.org/trunk@25123


git-svn-id: http://core.svn.wordpress.org/trunk@25103 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add post-type-$post_type and taxonomy-$taxonomy admin body classes.

props johnbillion.
fixes #19247.

Built from https://develop.svn.wordpress.org/trunk@25124


git-svn-id: http://core.svn.wordpress.org/trunk@25104 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Network Admin: Hide the bulk actions checkbox for the main site.

props ericlewis.
fixes #24463.

Built from https://develop.svn.wordpress.org/trunk@25125


git-svn-id: http://core.svn.wordpress.org/trunk@25105 1a063a9b-81f0-0310-95a4-ce76da25c4cd