Group for pre-binned data. Update todo
Initial implementation of hex grouping
Update group testing harness
Add origin to integer grouper
Reset unit testing infrastructure
Use correct rcpp attribute syntax
Also comment out 1d binning
Test that missing values put in group 0
Out-of-bounds values should belong to group 0.
Leads to simplified groupwise code
Bench mark advantage of using a temporary variable
Boundary tests for GroupFixed