function postostring(pos)
  return pos.x .. " " .. pos.y .. " " .. pos.z
end

function dirtostring(dir)
  for k,v in pairs(Directions) do
    if v == dir then
      return k
    end
  end
end

function comma_value(n)
	local left,num,right = string.match(n,'^([^%d]*%d)(%d*)(.-)$')
	return left..(num:reverse():gsub('(%d%d%d)','%1,'):reverse())..right
end