May-2021

Bug fixes, including in DateTime, is_equal(), write()
Rearranged code to make it easier to compile as DLL
Significantly improved docs both in terms of format and content
Implemented Percent Price Oscillator visitor
Added consolidated() for 4 and 5 columns
Added another version of shift() to return a copy of a single shifted column
Implemented Ulcer Index visitor
Completely redesigned groupby() interface and made it significantly more versatile
Completely redesigned bucketize() interface and made it significantly more versatile
Implemented Count visitor
Added ISO date format to DateTime
Implemented ability to read()/write() DateTime as strings into streams
Fixed a few move semantics to improve memory efficiency