tracker-extract: Make it clearer where MIME type came from in debug
tracker-sandbox: Make this Python script +x
tracker-sandbox: Locale and dbus fixes

Now we don't hard code the path to dbus-daemon.

We also don't force BUS or DIRECT connections, we let tracker-sparql decide
as it should.

Fixed locale mismatches:
This was causing tracker to throw out queries we try to make because the DB
locale didn't match the current locale. The script was using "C" locale vs
processes using "en_GB*" or whatever people are really using because tracker
processes use set_locale(LC_ALL, ""). We just did the same for this script.