Arkouda

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* more optimized groupby/aggregate using segmented scans
* fixed in1d bug
* added in1d unit test
* added groupby unit test
* refactored a bunch of code
* doubled speed of binary operators
* much faster sort added
* multi-level groupby added
* many other changes lost track of them all

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* added initial ak.argsort functionality
* added initial ak.is_sorted functionality
* added unit test to tests directory for ak.argsort
* optimized argsort
* added ak.where
* opt some a[pdarray] gather-indexing
* added initial ak.GroupBy and ak.aggregate functionality
* added optimized per-locale version of groupby and aggregate

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* fixed multi-file/multi-threaded bug in HDF5 I/O
* improved HDF5 I/O error handling + glob filenames
* added initial versions of ak.array() and pdarray.to_ndarray()
* refactored histogram and some other procedures using helper nested procedures
* added more operators for bool
* added min and max reductions
* optimized ak.int1d()

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* added toys/ subdir with some prototype sorting code
* made some changes to make naming consistent in Python and Chapel code
* added initial HDF5 I/O
* added a[slice] = value indexing
* added a[slice] = pdarray indexing
* added initial ak.argmin/ak.argmax functionality
* added some different optimizations and optional return of the counts from ak.unique
* added more error handling to GenSymIO (HDF5 I/O)

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* finally got a BlockDist to work properly -- thanks Brad ;-)
* changed ak.startup() to ak.connect() also added ak.disconnect()
* added initial version of value_counts
* added a[pdarray]=value indexing
* changed to bool_ = type(True) in arkouda.py
* added a[pdarray]=pdarray indexing
* compiled with chapel 1.19 and cleaned up compilation warnings
* substituted domain.contains() for domain.member()
* fixed up parallel scans on bool arrays with int cast through a copy to int array (blah!)
* created github repo
* added backward compat code for 1.18
* added some prototype python arkouda/numpy check/test code

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* added threshold to pdarray.__iter__() to limit comms with arkouda_server
* refactored how dist domain mapped arrays for symbol table entries
* added some more tests to ak_test.py
* simplified ones_like and zeros_like in arkouda.py
* added bitwise {&,|,>>,<<,^,~} operators to int64
* added unary-
* added initial version of histogram
* added bounds checking on pdarray indexing "a[iv]" where iv is an int64 pdarray
* moved all operator stuff into OperatorMgs.chpl
* factored the code put config const/param into ServerConfig.chpl module
* added initital version of in1d
* added initial version of randint
* cleaned up ValueError vs. TypeError in arkouda.py
* indexing operations moved to IndexingMsg.chpl
* added initial version of unique