CSV file names

[ajijohn]

@khxu I think might be better to create the CSV files with day month year (taken from UTC), instead of unix timestamp. What do you think ? I think , it'd be easier for select the files if we have data quality issues

[khxu]

Ah yeah, that'd definitely be a more human-friendly interface for reading the data files. Will add that to the raspberry pi mqtt script.

[khxu]

Okay, just updated the raspberry pi mqtt script to add year/month/day/hour in local time for the CSV files. Figured that would be easier for people visually inspecting the files. I think UTC time would be confusing because the user would need to add/subtract their local timezone. But could see an advantage to keeping everything in UTC. What do you think?