Add Previous and Current Labels to SetRecords

Move ExerciseTitle to (more general) Label. Add new input type for duration.
Now instead of having duration display inside the SetRecords div, the idea is
to have all inputs have their own entry in the DropDownMenu. Remove
RecordInputField and make RecordField handle both jobs; RecordField now handles
all record info including the new parameter SYSTEM. Modify sets to store it's
data using divisions (like all other DivisionSuites). Learn that css doesn't
align inline-blocks as I thought intuitive
http://stackoverflow.com/questions/18180180/ (big surprise..).