Merge pull request #255 in MT/custusx from release/v18.10 to master

* commit 'a9d46c7f': (78 commits)
  FX-56: Changed route to target length calculation to start at Carina (first bifurcation), as the full length of trachea is not always included in CT/airway segmentation. This makes the length more comparable from case to case.
  FX-56: Fix based on pull request comment. Removed one include.
  FX-56: Fixes based on pull request comments.
  FX-56: Empty commit. Build trigger..
  FX-56: Another bug fix for Linux build.
  FX-56: Bug fix for Linux build.
  FX-56: Created print to file of target/RTT information when target point is selected in Fraxinus. File will not be created when RTT is run manually from RTT widget. Also corrected rounding error in Extended RTT calculation.
  CX-364: Refactored duplicated code.
  CX-364: Refactoring out test class functionality in separate file.
  CX-364: Improve code readability.
  CX-364: Updated SHA for CX data repo.
  FX-53: Moving one typedef.
  FX-53: Cleaning code and removing functions that are not in use anymore.
  FX-53: Necessary uptades for inclusion of  AirwaysFromCenterline in Fraxinus.
  CX-364: Use latest version of CustusXData repo to make all tests run.
  CS-82: Fixes based on pull request review.
  CX-375: Fixed DICOM import z-axis spacing
  CX-320: Made create and delete build flag file functions
  CX-320: Create build flag file while building and runnign tests. Delete file when finished.
  CX-333: Try to run error detection test on Windows
  ...