Mask dtype fix for new numpy
any, all, integer cast, groupby sugar
remove, ls methods
percentile method
Add collapse method. Do not collapse by default during boolean masking
Tests for ls, remove, percentile
WIP. Utilities for bio use case
Pandas merge
left_on/right_on kwargs of merge
Fix datetime parsing with new numpy version
Handle cross joins along unbound dimensions
Handle nonoverlapping category joins.
Add name kwarg to new_array
sort ls. squash remove errors
Overhaul merge implementation
More utility functions
Parse empty arrays properly
Add license text
Test fixes
Groupby on categories. join-shortcut for merge