Update for 5.0 branch (improved document management (i.e. uploads), tp_admin_page_menu() replaced, small UI improvements, screen options for courses menus added). This is teachPress 5.0alpha7.

git-svn-id: https://plugins.svn.wordpress.org/teachpress/branches/5.0.x@970101 b8457f37-d9ea-0310-8a92-e5e31aec5664