Add EXP Chronology page

This feature aims to help course owners figure out how to set their levels. It is kept simple: course owners can copy and paste the table into a spreadsheet for further analysis. Surveys and forum participation points are not accounted for.
Would it be a lot less efficient, since for each training, we need to do a db query for the tab title? Right now, the tab_ids are already there, and we are doing just one query to get the tab names.