update the benchmark input and result files

Change the roughness of pipe to avoid the WARNING message in TESPy new version (0.1.3)
format the python scripts
update the benchmark test results

relax the error tolerance

[py] Formatted HeatTransportBHE_3D_3BHEs_array files.

Manually and with yapf.

[py] Removed duplicated instruction.
modify benchmark input

change the imported module; fixed local variables

change the imported pandas module to only csv_read; import the local variables from the network csv files;
Add comments in the Benchmark input file
Delete the unused variables in the script