Inactive users script

[catarial]

Extension of #1010

A command line python script that identifies and optionally removes inactive users.

The amount of time that defines an active user can be specified with the -t flag.

The threshold time is compared to the timestamps of API calls and locations in the database.

I decided to pull out the part where it get's run on all deployments in favor of more configurability.

[shankari]

I decided to pull out the part where it get's run on all deployments in favor of more configurability.

This needs to be restored. I am not going to sit and edit the DB_HOST variable 40 times and manually run the script 40 times.
I don't see why it is an either-or for configurability versus running on all deployments.

[shankari]

Also, how did you test this? Can you please update "Testing done"?
Please also put this into the correct column in the project (PR for review by Shankari) once you are done