system.nim: make min/max take openArrays, not varargs (breaking change)
system.nim: make min/max take openArrays, not varargs (breaking change)

tulayang/Nim,russpowers/Nim,tulayang/Nim,russpowers/Nim,dom96/Nim,russpowers/Nim,dom96/Nim,dom96/Nim,dom96/Nim,russpowers/Nim,tulayang/Nim,russpowers/Nim,russpowers/Nim,tulayang/Nim,dom96/Nim,tulayang/Nim,dom96/Nim,russpowers/Nim,dom96/Nim,tulayang/Nim