Backwards compatibility of .bw2package

[mrvisscher]

brightway2-io/bw2io/package.py

Line 85 in 2c0b3a0

# Compatibility with bw2data version 1

I can't seem to import .bw2package files from older Brightway versions. For my specific case I could enable backwards compatibility by adding the following lines to package.py.

if metadata["module"] == "bw2data.backends.peewee.database":
    metadata["module"] = "bw2data.backends.base"

I don't mind making a PR, but there are probably more edge-cases for which we need migration rules like these which I don't know of.