add setting to allow bags to stack

[fluxionary]

this is a redo of #237 as a defaullt-off setting.

[SmallJoker]

You could make this more generic by using stack_max to allow any stack size.

[fluxionary]

You could make this more generic by using stack_max to allow any stack size.

if someone has a use-case for that, that'd be easy to add on in the future.

[SmallJoker]

@fluxionary Which would add yet another setting which could be avoided right now in the first place.

Similar to your approach of using the default stack size, someone else might prefer to have stacks of 10 or 20. I am certain someone will come up with that request sooner or later.

[Bastrabun]

Please also disallow put when a bag is already present. That's not necessary when the stacksize is one, but any stacksize above 1 will cause more than one bag placeable in the bags inv.

diff --git a/bags.lua b/bags.lua
index f6d4da6..8936ebc 100644
--- a/bags.lua
+++ b/bags.lua
@@ -195,7 +195,9 @@ minetest.register_on_joinplayer(function(player)
                        if not new_slots then
                                return 0 -- ItemStack is not a bag.
                        end
-
+                       if not inv:is_empty(listname) then
+                               return 0 -- Disallow put when bag present
+                       end
:...skipping...
diff --git a/bags.lua b/bags.lua
index f6d4da6..8936ebc 100644
--- a/bags.lua
+++ b/bags.lua

For my reference 852