Prevent Uninstallation

```
I'd like there to be prevention of uninstalling the app. Perhaps by having the
app appear in the list in Location and security > Select device administrators
and in order to disable it as a device administrator, it require a password.

This would keep anybody using the phone from uninstalling droidwall and messing
with settings.
```

Original issue reported on code.google.com by `threehappypenguins` on 26 Feb 2014 at 7:33

The issue names no repository files or tests. Start by examining Android's Location and security > Select device administrators flow and the app's current uninstall and settings behavior; done means the app cannot be uninstalled or have its protection disabled without the requested password.

Written by the indexing model from the issue text.