Isolating records for specific devices or data values

I've added two Python3 tools to my stats repository that might be helpful to others doing detailed analysis of rtl_433 JSON logs:

• rtl_xtract_json extracts from a JSON log file all records for one or more specific devices into a separate file. Devices are identified by the "model/channel/id" keyword identifier in the rtl_433_stats report.
• rtl_json_csv extracts from a JSON log file and into CSV format the values of fields specified on the command line. The output is labeled with the "model/channel/id" identifier. A header line identifying the extracted fields prefaces the data to allow easy importing into spreadsheet programs.

These are available under rtl_433_stats