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fixing the messing columns for pipe properties #3664

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This fixes Issue #3562

How to test?
Use a smaller scenario and run network part 2 (detailed)
Compare results DH__velocity_edges_mpers and DH__massflow_edges_kgs.csv
The results (v) in the former .csv and results (m˙) in the latter .csv:

v=ρ⋅Am˙​

Here, v (velocity) depends on m˙ (mass flow rate, check DH__massflow_edges_kgs.csv) and A (cross-sectional area of the pipe, which depends on the pipe diameter, check Distribution.xlsx` in the Scenario Input database) and ρ equals 998kg/m3.

Can you be the reviewer of this PR? @KFSchlager

Thanks, Zhongming

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