- Implemented confirmation on big changes. That means if the description is
changed, or more than 2 tasks are modified in a single command.
- Implemented taskDiff to detect differences between two tasks.
- Implemented taskDifferences to describe differences between two tasks.
- Added a tri-state confirmation function for confirming bulk operations
allowing the user to answer yes/no/all to and optionally allow,
disallow or bulk-allow big changes.
