fix the omission of "…" after changing the threshold in CMTKLevelset (was committed earlier under the wrong message)
git: add gitignore for all image dirs
altered the Ttest command to compare 2 hemispheres with a paired t-test by flipping the jacobians
calculate the jacobian determinants to compare the two hemispheres
calculate the jacobians to compare the two brain hemispheres based on the symmetric template (for each sex separately)
generate the DvirBrains.txt that lists the sex for each brain. this text file is used by JacobiansSexComparison.R