Not optimized for fast typists

[briantjs00]

For /wview, you have to key in the whole date to be able to view the workouts done in that day which is trouble to type out the whole date.
It would be better for user to be able to view the workout activities by /wview [index of the date] as shown in /list.

This is also applied for every other commands such as /delete and /cview.