Page 'Parent' option when adding new page

[mkjones]

When creating sites with a LOT of pages I'd like to be able to create a link on my site similar to the edit_post_link() option but with the ability to specify a page parent when ADDING a new page.

For example, if I am viewing page "123" I'd like to have the ability to create a link that says "Create new sub-page for this page". This could then take the user to:

www.site.com/wp-admin/page-new.php?parent=123

Which would automatically set the "Page Parent" dropdown to the correct page parent.

Something like: add_post_link('parent=$post->ID') perhaps?

Done in this plugin:

​http://wordpress.org/extend/plugins/sem-admin-menu/

Browse the parent page, and click the New Page link.

Related: #8223

Closing as dup of #8223