Fixed issue with DateHelper

A window in time led to a buggy relative time string
Pill now loads it's consumptions when retrieved from the db

Can also get the latest consumption from a Pill
Add consumption now uses screen space better

This is in anticipation of future work
Added last taken information to new consumption
Added more padding to the bottom of the new consumption activity
Single quantities are back
Added default units for a Pill
Tried to sort all pills by consumption date