Update snakebids and add conda support

[Dhananjhay]

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[Dhananjhay]

I was successfully able to run:
./scattr/scattr/run.py ~/graham/projects/ctb-akhanf/djay/synthstrip/ ~/graham/scratch/test-scattr participant --participant-label P003 --freesurfer_dir ~/graham/projects/ctb-akhanf/djay/fmriprep_all/sourcedata/freesurfer/ --dwi_dir ~/graham/projects/ctb-akhanf/mliu366/4_SNSX_7T/derivatives/prepdwi_v0.0.13/prepdwi/ --cores all --fs-license ~/graham/projects/ctb-akhanf/akhanf/opt/freesurfer/.license --show-failed-logs --use-conda --skip_thal_seg --bzero_thresh 50 --rerun-incomplete --filter-T1w desc=synthstrip --force-output --until tckgen --omit-from tckgen

Point to note though: I had to copy over zona_bb_subcortex dir to the output dir from when I ran the pipeline with the thalamic_segmentation rule before running the above pipeline.