gtSegmentationInitialise : Set segmentation method to 'doublethr_new' to be distinguished from 'doublethr' (standard segmentation routine)
  NewSegmentationPreGUI    : Check existence of difspot images before running segmentation and asking for their deletion.
  gtSegmentationLaunchOAR  : implemented the OAR submission using more cores on a single machine (default are 6 cores on one machine with 8000 Mb/core)
                             Difspot images should be saved in 2_difspot/00000, 2_difspot/10000, etc...

Signed-off-by: Laura Nervo <laura.nervo@esrf.fr>