H&R Block Inc. plans to reinvent the tax preparation process through a partnership with IBM Watson that adds data-mining techniques to its in-office tax preparation services. IBM Watson is a data analytics processor designed to help humans make better informed decisions. The computer system with built-in cognitive functions originally gained fame after competing and winning against human beings on the game show "Jeopardy!" More recently, New York-based technology company IBM (NYSE: IBM) has been…