added new field to tag_records db table to facilitate using secondary tags in performance tracking.
fixed test for Walk.map()
Added passing tests for PathChooser.choose() and PathChooser._order_cats(); expanded mypathchooser fixture.
Added passing tests for PathChooser.choose() and PathChooser._order_cats(); expanded mypathchooser fixture.
fixed test for Walk._get_user(), now passing