* Add a prepared query command to CLI.
* Print nanoseconds in the REPL. This is a good problem to have.
* Better CLI timing.
* Use release for 'cargo cli', debug for 'cargo debugcli'.
* Don't enable debug symbols in release builds.
* Clean up CLI code. Fixed order for help.
* Column-align help output.
* Update fixtures to match the current storage schema.
The existing files were a little misleading. This commit moves them into an 'old'
directory, and creates a new 'v1empty.db'.
* Add empty example Toodle database.
* Rename :item/labels to :item/label in Toodle schema.
* Define 'cargo cli' as an alias to run the Mentat CLI.
