remove orphaned pipes and ducts

[santoshphilip]

When building an HVAC loop, the following workflow happens:

1. hvacbuilder builds the topology of the loop using branches with pipes or ducts
2. Once the topology is built, you replace the pipe/duct in the branch branches with the components you need.
3. this will leave the original pipes or ducts orphaned in the idd file
4. Energyplus will throw an error those pipes or ducts are left in the file

These orphaned pipes or ducts need to be removed. I have some scripts that do this. Modify the scripts into functions that anyone can use

[santoshphilip]

the solution would be to remove the orphaned pipes in step2 above