Move scripts in app/scripts

I kept two separate commits, one to move the original file, the other with the actual changes (if I squash the commits, the entire files will be displayed as changed)

* Python files: SafeConfigParser doesn't accept relative paths, so we need to determine the absolute path for ```../config/config.ini```. Also used ```os.path.join``` instead of concatenating Unix filenames (e.g. bugzilla_query.py)
* setup.sh worked only if launched from the root

I tested locally, manually and in cronjob, seems to run well.