Add properties to double pipes and write them to dck automatically

[ahobeost]

Double pipes need a length and probably other properties as well.

[zuckerruebe]

@ahobeost: Is this ready for review? If so could you move it to the corresponding column on the board and create a pull request?

[ahobeost]

@zuckerruebe: The Dialog needs a test, and I am going to manually try this first before creating the pull request

[ahobeost]

Test throw a windows fatal error. @zuckerruebe have we fixed this in Master yet?