A stab has_many :remarks and a remarks belongs_to :stab
Track when a puzzle was last picked ...

This will allow us to identify puzzles from N ( >= 0) days ago - should be need to.
Added support for stabs in receive_single_scan
Minor bug: Needed to create the stab in receive_single_scan - not just instantiate it
Renamed strength column to quality (for consistency's sake)

Quality is also defined for attempts
Initial UI for stab support