Include T2 analysis

[thewtex]

There is a “T2_analysis” branch in “OAI_analysis_2" that Boqi wrote. As well as a “notebooks/T2Demo.py” for the demo and here’s the affine registration model: https://drive.google.com/file/d/156LnBZqv3lEQUdcmzYYPHqBKyjoTVrr3/view?usp=share_link