Oct-2021

Fixed bugs, including in multithreading, groupby + Removed all warnings
Improved documentation
Improved/tightened multithreading + SpinLock is now recursive
Implemented RateOfChangeVisitor
Implemented AccumDistVisitor
Added single_act_visit() for 5 columns
Implemented ChaikinMoneyFlowVisitor
Implemented VertHorizFilterVisitor
Implemented OnBalanceVolumeVisitor
Implemented TrueRangeVisitor
Changed the ReturnVisitor logic to start with a NaN and have the same length as input
Implemented DecayVisitor
Implemented HodgesTompkinsVolVisitor
Implemented ParkinsonVolVisitor
Implemented concat_view()
Added hello_world.cc
Implemented get_row() that always includes all columns