Postprocessing lace simulations

1. Extract skewers from the simulations
1. 1. Specify simulation snapshots from which extract skewers.
      input.txt, file created using notebooks/input_post.ipynb
1. 2. Launch jobs using condor_submit extract.sub
1. 3. Check that all skewers are in scratch
      python check_sks_scratch.py $(sim_number)

2. Compute power spectra from skewers
2. 1. Launch jobs using condor_submit pks.sub 
      (same input file as to create skewers)
2. 2. Check that all pks are in scratch
      python check_pks_scratch.py $(sim_number)

3. Move data from scratch to common
3. 1. Run script scripts/scratch2common.sh to move data
3. 2. Check that all skewers and pks are successfully moved to common
      python check_common.py $(sim_number)

4. Delete data from scratch (by hand)
   /data/desi/scratch/HydroData/Emulator/untar_hydro_sims/Australia20/
   /data/desi/scratch/HydroData/Emulator/test_jonas/