Fixed: Time Sheets not being displayed on landing page in user view
(https://trello.com/c/LJlgDmdU).
Added debug logging to `WorkerService`, `TimeSheetDao`.
In progress: For Users, enforce that a Worker must be defined
(https://trello.com/c/TnxZUtrJ).
Fixed TimeSheet admin/user nav menu display toggle.
In progress: Handy Admin Links: Worker page (1/2,
https://trello.com/c/hLlaltXz).
Added field `TimeSheetView.printableTimeSheetString` for standard/shared
output formatting.
Complete: Handy Admin Links: Worker page (2/2,
https://trello.com/c/hLlaltXz).