* Use buttons for next and previous page in search results
* Add custom routine for stringifying and parsing the selector to JSON
so RegExp objects are preserved
* Generate error when a comment text is not found
* Save errors to SessionData as objects
* Move all search code to globalSearch publication
* Add more translation tags
* Add new SessionData collection to store user session data available to
server and client
* Limit the Users fields sent to the client by `myCards`, `dueCards`,
`brokenCards`, and `globalSearch` using new `Users.safeFields`
* clean-up