Introspection

[Colin Walters]

One thing that came up in the initial report is introspection.  Almost
nothing explicitly allows it right now.  I see a few options:

1) Have projects use rules of the form
    <allow send_destination="org.freedesktop.Hal"
               send_interface="org.freedesktop.DBus.Introspectable" />
2) Add rule syntax like: <allow introspect="org.freedesktop.Hal"/>,
and add that to the config files
3) Blanket allow introspection as a global exception to the default-deny policy

Opinions?  Other options?  1) and 2) require updating almost
everything, 3) requires another DBus release.