- when caps are set

- add some comments
- add some extra error checking to set_property()
- have unpack() take ownership of val.  simplifies decref
- change error path in get_caps_filter()
- change query failure from an error message to a warning

updated changes to the openblas makefile to make it work on sandybridge-- linking doesn't work 100% yet, but it no longer fails on building lal

- sink event handler needs to chain to parent class, not try to handle the
  event itself or it can create event ordering problems.  in particular,
  what was there was resulting in segments and caps being pushed out of
  order.
- change the sink event handler's name, too, for readability

- the element seems to work OK without this, but I'm adding it just in case there's some linkering lock-up risk at shut-down that this fixes

- it seems the chain functions must not return GST_FLOW_FLUSHING.  it seems to result in lock-ups, but I don't understand why.  I don't understand if the lockups are a bug in this element, or that we're triggering a lockup in gstreamer
- I'm inclined to believe it's the latter, that returning GST_FLOW_FLUSHING was a non-conformance bug in this element but that it had no negative side effects before while now it does

- move logic for flushin control queue up to some time into a function

- in control_chain() rename sinkbuf to controlbuf for readability

- query the upstream peer, not ourselves.

- move properties to GObject overrides section

- also the upstream event handling was totally busted:  there is no upstread SEGMENT event, it's an upstream *SEEK* event that needs to be intercepted and adjusted (segments are downstream).