~6x speedup for find-pictures.py
~6x speedup for find-pictures.py

nypl-spacetime/oldnyc,danvk/oldnyc,danvk/oldnyc,danvk/oldnyc,luster/oldnyc,luster/oldnyc,nypl-spacetime/oldnyc,nypl-spacetime/oldnyc,nypl-spacetime/oldnyc,nypl-spacetime/oldnyc,danvk/oldnyc,luster/oldnyc,luster/oldnyc,luster/oldnyc