Adjustments to reduce mass imbalances in Ecoinvent v3.10.

Data_A shows the amounts of obvious missing flows that need to be added to each activity in ecoinvent v3.10. Data_B shows the initial and final mass estimates of products in the ecoinvent database while Bel shows the final and initial mass estimates for elementary flows. Data_Gamma shows which activities lack end-of-life flows for capital uses. Data_Eprod shows which products have been disaggregated into which alternatives while Data_Eact shows which disaggregated products interact with which (disaggregated) activities. El_flow_bounds gives the minimal and maximal mass for every elementary flow. Product_pounds gives the minimal and maximal mass bounds for every product.