Proof of concept data tools for CSV, JSON and XLSX files

This is a set of tools for working with JSON, CSV and Excel Workbook content. It includes the following
tools

• csvcols - filters or display CSV row outpout
• csvjoin - joins two CSV files by match designated column values in each file
• jsoncols - filters JSON dot paths into columns in CSV format (by default)
• jsonrange - iterates over JSON object (e.g. an array identified by a dot path) rendering one element per line
• xlsx2json - converts an Excel Workbook sheet into a JSON 2d array
• xlsx2csv - converts an Excel Workbook sheet into CSV
• csv2mdtable - converts CSV into a Github Flavored Markdown table
• csv2xlsx - convert CSV into a designated Excel Workbook sheet