-return simple clearing to the initial state

-as this wasn't the issue

assume/markets/clearing_algorithms/simple.py

@@ -116,12 +116,17 @@ def clear(
                 elif diff > 0:
                     # generation left over - split last generation bid
                     supply_order = to_commit[-1]
+                    split_supply_order = supply_order.copy()
+                    split_supply_order["volume"] = diff
                     supply_order["accepted_volume"] = supply_order["volume"] - diff
 
                     # changed supply_order is still part of to_commit and will be added
                     # only volume-diff can be sold for current price
                     gen_vol -= diff
 
+                    # add left over to supply_orders again
+                    supply_orders.insert(0, split_supply_order)
+
                 else:
                     demand_order["accepted_volume"] = demand_order["volume"]