babeltrace | sink.ctf.fs: add support to create LTTng index

[MOESSBAUER, Felix]

Hi,

I recently created a babeltrace pull request that adds support to
create an CTF LTTng index file along the CTF files [1].

It would be great, if someone could review it.

[1] https://github.com/efficios/babeltrace/pull/123

Best regards,
Felix Moessbauer

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