[gpm] Some relatively straightforward TODO items

[David Zeuthen <david fubar dk>]

Hi,

Richard asked me, because he's busy rocking on PackagaKit, to send mail
to this list with a few easy TODO items that we identified after I fixed

 http://bugzilla.gnome.org/show_bug.cgi?id=486138

I'll list them here

 - Audit all call sites such that a proper GError** pointers are passed;
   basically the lack of these cause that bug and also another annoying
   one: https://bugzilla.redhat.com/show_bug.cgi?id=312761

 - Fix up uses of dbus_g_proxy_call() to use the _with_timeout variants
   instead. This is necessary as the standard timeout is 15 seconds and
   for things like suspend / resume the timeout can be measured in hours
   and often days. Should use INT_MAX as the timeouts for hibernate and
   suspend... 

Thanks,
David