+ Reworked rarity system, now the range is from 1 to 10 and the rarity
gap is handled by the mod
+ Now it's possible to equip an armor from on_place too
+ BUGFIX: Chests id weren't generated properly
+ Now addchest takes the position of the node the player's looking at
(the old cmd is now callded "addchest pos")
+ Help section corrected
+ Code cleaning