Harmonize multi shell data: Yogesh

[tashrifbillah]

cc: @yrathi @suheyla2 @sbouix

• [x] Yogesh approved creation of master branch based on warped-in-template branch
• [x] Multi shell algorithm discussed with Yogesh
• [x] Until new test data is given, connectom_prisma test data will be used publicly
• [x] Waiting to get ABCD multi shell test data
• [x] Develop multi-shell branch based on current master branch