A user should not be able to delete themselves #12
Description
Simply put, an admin user should not be able to delete themselves. I believe it's a bug that this is currently possible.
Since the application uses the existence of at least one admin user to determine if it's installed or not, you shouldn't be able to implicitly uninstall the application from within itself.
And note that when the application is "uninstalled" the admin panel becomes inaccessible, as the server will continue to redirect to the installation client, until that process is finished.
If an admin user (in most cases, the developer setting up the application) wants a new username, they can either (1) change it in the database or (2) create a new admin role user, login under that account, and then delete the original.
Note that #11 needs to be completed for option 2 above.