* Rename `depth` and `depth_interp` to `bottom_depth` and `bottom_interp`.
  This is for consistency and to reduce ambiguity; without the rename, not clear if `depth`
  refers to the simulation depth or the bathymetry.
* Rename `surface` to `surface_depth` for consistency with the above.

*Other changes*

* Add Internoise 2026 conference paper to repository
* Add extra Fortran style ignore flags (Fortitude updated and is more strict now)