MDL-37009 Display course search results using new renderer methods
MDL-37009 Display list of tagged courses using new renderer
MDL-37009 new course listings: changes to base, standard and afterburner themes
MDL-37009 new course listings: changes to canvas and other themes:

canvas-based themes: formal_white, magazine, splash
some minor changes to print_course_request_buttons() - don't know why
--- accidental commit
EXPERIMENTAL: add 'can-access-course' class to accessible courses