Distinguish variable names: rows_csv_* vs rows_*
Fix dataset generation bug
Clean up loom/format.py
Simplify load_encoder, load_decoder
Fix bug in boolean decoder
Merge branch 'master' into sparse-value
Add sparsity type NONE (still broken)
Add NONE target to ValueSchema::normalize_small
Fix bugs in ProductValue operations (still broken)
Use observed.dense in query server (still broken)
Merge branch 'sparse-value' into sparsify
Split sparsify.hpp into differ.hpp + differ.cc
Add runner + benchmark bindings to sparsify + tare