Added utility scripts for making zip files of testing data
- Fixed bug in normalize_roof_patches.c:normalize_roof_patches() where
  the final entry in the flow table was being skipped (off-by-one error), which
  addresses issue #15.
- Changed how nearest_neighbor_grid_search.c:grid_search() handles search
  predicate failure.  This is now not a fatal error (as it can arise when
  we are searching near the edge of the domain), so searching should continue.