Add format template to date and hour in add sample

Add `mm/dd/yyyy` to the side of each of the date text entry boxes in the
three `add_sample_*.psp` menus, as well as `hh:mm AM/PM` for the collection
hour.

Note that I selected `hh:mm AM/PM` instead of `hh:mm tt` because I figured it wouldn't be clear for some people.