Separation of local statistics class from inbuilt library

[glenm-nz]

Not functionally broken, but just an idea to clear a few warnings in the IDE

.../selpi/statistics.py" is overriding the stdlib module "statistics"

Could it be considered to:

• rename statistics.py to selpi_statistics.py
• Modify from statistics import Statistics to from selpi_statistics import Statistics in the following files
• http-select.py
• http-py
• stat-select.py
• stat.py

The issue is occurring in Ubuntu 24.04 LTS, and in line with Ubuntu's apparent move away from PIP, I'm using the APT managed modules instead.

Just for context of what I was doing when I ran into the above - I have been running an adapted version of Justin's code for years (runs as a service) to Publish values to MQTT (For consumption by OpenHAB and EmonCMS). I was starting to refactor it for some minor improvements, but also having a look at your code as a possible alternative option (Adding a 'MQTT' command, which publishes the stats to MQTT topics on a predefined interval). Just a half-baked idea at this stage !!

Cheers