Added support for filling empty bottles with XP to obtain Bottles of Enchanting and draining Bottles of Enchanting to get XP back, leaving an empty bottle, in the Tank Upgrade.
Changed settings default so that shift clicking puts stacks into inventory/storage first by default instead of putting these into open upgrade tab (like Crafting Upgrade's one)
Added "Keep Player at Level" option to Xp pump upgrade - as it says on the tin will try to keep the player at set level whether it means taking xp away and putting it in tank or giving player xp back from tank
