Modifies the lsd command to group by date, not date-time

[beauraines]

The current lsd command groups tasks by date-time, so that if you have a task due at 1PM and 2PM on the same day, it will get multiple entries BUT they will all say the due date, e.g August 28. This groups tasks returned by lsd by date, ordered by the due time and if the task has a non-midnight time assigned to it, will display the time due.