Changeset 15696f3 in git

src/commands.c,tests/: For ages cavern has warned if you reentered
a survey, but this warning was suppressed if it occurred at the
same line of the same file as the survey was first entered, which can
only happen if you include the same survey file more than once, which
isn't a sensible thing to do for a file with actual survey data in
(you might reasonably do it to set up survey grade details or
something like that). The warning is now given in this situation
too.