Merge pull request #472 from mpd/master

Fix sending multiple buffers to the extension.
Merge pull request #474 from mpd/master

Resetting a trace from the HUD now resets workers as well.
Merge pull request #475 from mpd/master

Load each source serially.
Merge pull request #476 from mpd/master

Sort zones so that workers are on top.
Merge pull request #477 from mpd/master

Add flow information to the tooltip.
Make workers have unique flow IDs.
Merge pull request #479 from mpd/workerid

Make workers have unique flow IDs.
Add the ability to filter by flowid.

Adds @flowid as a builtin filter parameter. Currently only filters on
the first ID, but allows highlighting of one flow in the tracks panel.
Merge pull request #478 from mpd/filter

 dd the ability to filter by flowid.