Release Name: DTIAtlasBulder_v1.6.4-linux64

Notes:
- DTIAtlasBuilderResults.csv is now being generated for all the sub atlases
- DTIAtlasBuilderResults.csv for the concatenated displacement fields is generated in the project root directory with the same name. This file has the original images' paths, the first level intermediate files and the concatenated displacement field file path from the final atlas to the individual images.
- Parallel build using multithread enabled (Change the number of thread to use in Software configuration tab)
- Desirable usage : set the number of thread whose multiple is equal to the number of end-nodes to maximize the parallelism
- New action in file menu added : Open Project Directory, which loads all the parameters and hierarchy from an existing project directory
- New action in tool menu added : Generate Project Directory, which generates all the necessary files for the project and doesn't execute the script.
- Generation of deformation fields track file for the concatenation by ITKTransformTools
- Concatenation of deformation fields from hierarchical atlas structure.
- Hierarchical atlas build has been implemented.
- Treeview implemented for GUI users to generate the hierarchy.
- Deformation field track file is generated for the concatenation over multiple level atlas build.
- MriWatcher can view the final atlases for QC.
- DTIAtlasBuilderParameters.txt now has version 4, where iteration over final resampling is added and dataset csv file field is removed.
- ITKTransformTools is added to the installation binary directory as a tool for the concatenation of deformation fields
- Project directory scaffolding has been changed to 'atlases','final_atlas','common','scripts'