since "trace" is such a generic term, this makes it easier to actually find the feature when you need it.

And add feature to limit stack depth of the reported backtrace.

Change-Id: Iab3e4ceb2e8480e7b5e2b920eb6c5d7631e21c43
Reviewed-on: https://gerrit.libreoffice.org/31752Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Noel Grandin <noel.grandin@collabora.co.uk>