[personal.__init__] Upgrades will overwrite this file

[5iver]

Describe the bug
The default installation includes an empty person.init.py file. This was done because you can't have an empty directory in git. If a user modifies this file, it could be overwritten during an upgrade.

A possible solution is to rename the personal.init.py to personal.init.py.example, as is done with configuration.py. The installation documentation would need to also be updated.