ENH: Depending software have been moved from NITRC (SVN) to Github (git)

External* files have been updated to the new repositories of the software. CMakeLists.txt have also been updated. Some files that were unused have been removed.
ENH: Updated version of DTIProcess and updated ITKv4 configuration options to be able to build the new version of DTIProcess
STYLE: Addition of a license file and a readme file
Merge branch 'master' of github.com:NIRALUser/NeosegPipeline

Conflicts:
	SuperBuild/External_DTIProcess.cmake
ENH: Updated version of DTIProcess and updated ITKv4 configuration options to be able to build the new version of DTIProcess
STYLE: Addition of a license file and a readme file
Merge branch 'merging'

Conflicts:
	SuperBuild/External_DTIProcess.cmake