Add filter for top level category + show information for top level category

README.md

block_course_overview_campus.php

lang/en/block_course_overview_campus.php

lib.php

settings.php

version.php

...ilter/moodle-block_course_overview_campus-filter-debug.js

...-filter/moodle-block_course_overview_campus-filter-min.js

...mpus-filter/moodle-block_course_overview_campus-filter.js

yui/src/filter/js/filter.js