itk4 does not like the fact the the 0th input remains empty, I had to change the template type of both filters so that the 0th input becomes the FixedImage instead of the velocity field
itk4: these typedefs are defined in IntTypes now
itk4 compat and commented code removed
trying to solve itk4 compat
adding the cylindrical coordinate transformation
itk4: and try-catch errors
adding the cylindrical transformation option in FORWARD command