v1.17, swapped 47 and 61

Update 1.16:

• Fixed save-files so achievements will persist across patches.

Update 1.17:

• Swapped 47 (discard) and 61 (cover). Hopefully cover-stone is viable again at 47 energy.
• 47-stone "Discard lowest card" is now 61-stone "Discard highest card" to be more useful but prevent discard-spam. (Discards rightmost non-number card if no number cards are in hand.)
• 29-stone reverted. (No longer immune to discard effects, but simply stays in hand when played.)
• Misc small changes, e.g. final boss now uses 91 instead of the tricky-to-use-well 87 (29*3).