A column that is absent from the table assigned to species_params<-() or
given_species_params<-() is one the user no longer supplies. Mizer
calculates afresh those it knows how to calculate, and the rest leave the
model altogether. This reports the ones that leave the given species
parameters, whether or not mizer puts a calculated value back.
signal_removed_species_params(withdrawn)NULL invisibly. Called for its side effect of signalling.
A character vector of the withdrawn column names. Nothing is signalled when it is empty.
The report is made at level 3, so it is visible in ordinary use and silent
from info_level 1 downwards: removing a column is what the user asked for,
not something that went differently from how they asked. It carries the
class info_about_removed for code that wants to catch it in particular.