Building dynamic biosphere fails if same code exists more than once in databases

[TimoDiepers]

Here, we have to come up with a more robust way of getting the "original biosphere flows".

bw_timex/bw_timex/dynamic_biosphere_builder.py

Lines 160 to 163 in de4b79b

	if original_db == "temporalized":
	act = bd.get_node(code=original_code)
	else:
	act = bd.get_node(database=original_db, code=original_code)

[TimoDiepers]

Workaround: make biosphere db codes distinct in case multiple copies exist in a project