BSM2-P Effluent Metrics w/o Flowsheet Constraints

[MarcusHolly]

Fixes/Resolves:

This PR is similar to #1489, but it does not attempt to implement the effluent violation constraints in the BSM2_P_extension flowsheet - this will be handled in a separate PR. The constraints related to the effluent metrics are derived from the work of Flores-Alsina (specifically perf_plant_ss.m).

Summary/Motivation:

Define the effluent metrics for the BSM2_P_extension flowsheet

Changes proposed in this PR:

• Adds effluent metrics to the modified ASM2d property package
• Updates the BSM2 GUI flowsheet images
• Updates unit model tests affected by the changes made to the modified ASM2d prop pack

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[adam-a-a]

Why comment these out?

[MarcusHolly]

I think this test was written to check that the constraints for VSS, ISS, TSS, COD, etc. were only built on-demand, but I've changed them from constraints to expressions, so I don't think this test applies anymore. On that note, I don't think I need to be touching the effluent properties in the flowsheet anymore either.