[Bug 760979] tracers: Allow adding tracers programatically without defining environment variables

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=760979

--- Comment #16 from Thibault Saunier <tsaunier at gnome.org> ---
(In reply to Sebastian Dröge (slomo) from comment #14)
> Add the documentation improvements before pushing though.

Did that.

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