Add options for changing settings file location

[Paul-Reed]

Enables the settings.php file to be moved outside of HTML route.
See this quick video.
This PR accomodates the following paths, but others could be very easily added for different operating systems, such as DietPi, etc;

• home/pi/.emoncms/
• home/pi/
• or compatibility fallback of emoncms installation directory

Main advantages are;

• Makes it easy to import/export as most things are in one directory
• Moves settings file out of html path
• Makes it easy to delete emoncms & reinstall afresh from git
• Backwards compatible

[Paul-Reed]

Submitted for discussion at this stage.
If this is the direction that we would want to pursue, I would suggest that I update the raspberry pi installation guide to reflect this, and possibly create a small bash script (in /scripts) to create the new directory structure, set ownership, and copy across default.settings.php to the new structure (as settings.php).
This would cut several steps out of the installation guide.

Paul

[pb66]

Hi Paul - I've replied on the forum thread https://community.openenergymonitor.org/t/move-data-settings-file-to-a-common-location/6464?u=pb66