Updated Storage.getByID() methods with channel parameter.

- Channel parameter is optional
- For use in issue #300
Updated editing commands for issue #300.

- Updated all methods which use Storage.getEditById()
- Synchronized 'edit not found' messages
Updated other commands that use a Storage.getByID() method. (issue #300)

- Also synchonized 'not found' messages
Updated some output text.

- Removed leading spaces in 'add' command  messages
- Updated 'list' command messages when no data is found
Fixed handling of 'page' parameter for 'list' commands.

- The 'page' parameter will default to the total number of pages,
  if it's greater than the total