added connect_sides to appropriate tube tables

hdastwb

2013-07-21 2e4d983be7592af81b49f95895acf064b8ec38a2

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function get_item_meta (string)
    if string.find(string, "return {") then
        return minetest.deserialize(string)
    else return nil
    end
end
 
function set_item_meta (table)
    return minetest.serialize(table)
end