Create a template

There were two steps in generating a template, first creating an initial template to set up a space for the template. The second step is to create a population template from that initial template.
The initial template is first made by taking all the 3D images and using affine registration only, register them together, using the 'buildtemplateparallel' command in Ants. The argument for the -d option indicates the dimensionality; the -m indicates that we are using 1x0x0 iterations per registration; the -o argument defines the output prefix, and -c controls for the parallel computation, with 5 indicating that it uses a SLURM workload manager.