fix an bug where we couldnt index an stack properly

src/main.lua

@@ -677,11 +677,12 @@ local function VP_splitstack(_stack, x)
     end
 
     local out = {
-        height=height
+        height=height,
+        stacks={}
     }
-    if #unevenstack > 0 then table.insert(out,unevenstack) end
+    if #unevenstack > 0 then table.insert(out["stacks"],unevenstack) end
     for _,v in pairs(stacks) do
-        table.insert(out,v)
+        table.insert(out["stacks"],v)
     end
     return out
 end
@@ -902,11 +903,11 @@ while true do
             stacks = VP_splitstack(stacks, expam+1) -- plus 1 because we also build as the master turtle.
             for i,v in pairs(accepted) do
                 reset()
-                print("ID "..tostring(v).." needs "..VP_calccost(stacks[i], stacks["height"],dimensions["x"],dimensions["z"]).." blocks.")
+                print("ID "..tostring(v).." needs "..VP_calccost(stacks["stacks"][i], stacks["height"],dimensions["x"],dimensions["z"]).." blocks.")
                 print("Please ensure that turtle has that many blocks and press enter to continue.")
                 read("")
                 rednet.send(v, {
-                    stack=stacks[i],
+                    stack=stacks["stacks"][i],
                     dimensions=dimensions
                 }, "HB_vprint_pairacknowledge")
             end