Switch to a system of assigning tags to pages by specifying pages in the tags detail dialog rather than specifying tags in the page properties dialog.
Get rid of site propagation option in tag details dialog, since we are switching to a system of assigning pages to tags with insert in subpages option.
Get rid of modifications to page properties dialogs, since we are switching the a system of assigning pages to tags with insert in subpages option.
Get rid of page dependencies subapp in Tags App since we can see what pages depend on a tag from the tag details dialog.