ENH: renamed transforms for 4.1-Average Creation-ANTs

Files were called HFields but are actually displacement fields.
Merge branches '4.1-hfieldrenameddisplacementfield' and 'master'
BUG: When the average image was computed with ANTS, the mask resulting from the average was covering the whole image. This is due to the fact that the background of the average image computed by ANTS was not exactly set to 0. We replaced the commands computing the mask by a simple threshold below 1
4.1-AverageCreation-ANTS fce8d18] BUG: When the average image was computed with ANTS, the mask resulting from the average was covering the whole image. This is due to the fact that the background of the average image computed by ANTS was not exactly set to 0. We replaced the commands computing the mask by a simple threshold below 1
Merge branches '4.1-AverageCreation-ANTS' and 'master'
ENH: enhanced sync with Killdevil and scripts reconfiguration

-files names "cores*" created on killdevil are not copied back on our servers anymore
-When modifying the list of cases, this also affects the 4-AverageComputation, 4.1- and 5- steps that are in AllCases such that those files do not need to be manually reconfigured anymore.
Merge branches 'Killdevil-update' and 'master'