In addon:OnEnable(): Added a "Scanned" table member to the Player table, set all keys to the profession names and all values to false.

In addon:OnEnable(): Added a "Scanned" table member to the Player table, set all keys to the profession names and all values to false.
In addon:Scan(): Set the player's scanned value for the current profession to true.
In the GameTooltip hook for OnSetUnit: Check to see if the player has scanned the given profession before checking to see if the recipes are known so as to not print false positives.