Added 2 functions from transformations between vtkMRMLVectorNode and vtkMRMLTransfromNode
Added first version of function convertVectorToTransform
Added missing InvVector at update MRML
Added Transform and InvTransfrom node
Logic for conversion between transformation and vectors.
Scripted module that reads directory files and creates subject hierarchy out of it.
Added some output.
Creation of Registration Hierarchy node with basic read options
Fixed CMakeList
fixed merge problems
Added reference phase attribute.
Added constatnts.
Added first instance of basic logic.
Changed AbsoluteDifference and SetDefaultDisplay logic and added ComputeDIRQA.
AbosluteDifference now accepts two volumes and outputs false color volume. The idea is that other modules are now able to access it without the need for MRMLRegistrationQualityNode.
SetDefaultDisplay takes no arguments and just sets reference and warped image on display.
ComputeDIRQA now makes the neccesery computations, that were before in AbsoluteDifference.

Next step is to do the same for Jacobian and InverseConsistency.
Fixed default values for absdifference and removed search for registrationqualityNode in absdiff logic.
Changed logics for jacobian and inverse consistency, that they return Scalar Volume Node. You have to input vector volumes as parameters.
All reading from registrationqualitynode is done with ComputeDIRQA logic, with number 2 and 3.
Added constant names to module and set them to attributes
First working version of RegistrationHierarchy widget.

1. Added DIRQA logic (only Absolute Difference for now)
2. Added Statistics logic
3. Added Compute all phases button & logic
4. Added Show & Compute DIRQA option in context menu
5. Added load reference phase
6. Added progress bar (not fully operational)
Test Registration Hierarchy node
Minor debuging