Fill gaps in Hestia to ecoivent biosphere mapping

[TimoDiepers]

So far, we only have a preliminary version for the milestone. There remain some gaps that need to be filled for Hestia flows that don't have an ecoivent equivalent.

[tfardet]

Does #56 change anything about this issue? (I expect not, but just checking)

[cmutel]

@tfardet No, this helps but there are flows labelled in other groups which could also be matched the to the ecoinvent flow list.