Feature Request: New charts to show Accounts Created, Unsuspended, Suspended and Deleted

Confession time as I showed this @larsxschneider today as it used some of the Hubble code to display the graphs.

Produce graphs to show the number of user accounts:

- Created
- Unsuspended
- Total of Created and Unsuspended
- Suspended
- Deleted

This is really useful to see account trends, We are being asked:
How many new users are there?
How many returning users are there?
How many accounts have been suspended?

If it is also cumulative over time, you can see the overall trend.

This can be done by looking in the audit log for:

- user.create
- user.unsuspend
- user.suspend
- user.delete