tmf: Change Offset Dialog advanced mode layout

Change-Id: I06d67eed0b6a8c8cc341a36079baa069507eb065
Signed-off-by: Patrick Tasse <patrick.tasse@gmail.com>
Reviewed-on: https://git.eclipse.org/r/35270
Tested-by: Hudson CI
Reviewed-by: Genevieve Bastien <gbastien+lttng@versatic.net>
tmf: Update user guide for time offsetting

Change-Id: I4cd45175c8030bf18dd3013bf5fc91b21676e09c
Signed-off-by: Patrick Tasse <patrick.tasse@gmail.com>
Reviewed-on: https://git.eclipse.org/r/35164
Tested-by: Hudson CI
Reviewed-by: Genevieve Bastien <gbastien+lttng@versatic.net>
tmf: Add unit tests for time offset

Change-Id: Ib44c6acb6f8bb0e3d23a583e30e6fec7071686b3
Signed-off-by: Patrick Tasse <patrick.tasse@gmail.com>
Reviewed-on: https://git.eclipse.org/r/35271
Tested-by: Hudson CI
Reviewed-by: Genevieve Bastien <gbastien+lttng@versatic.net>