fuelColumns.RdAs they arrive from fireSense_dataPrepFit, fuel biomass columns are on the
fireSenseUtils::logMinB() scale, whose floor is 3.6; every other non-annual covariate is an
indicator or a proportion, at most 1. So a maximum above 1 marks a fuel column, which is the rule
deriveCovMinMax() always used to find them.
fuelColumns(nonAnnualList)character vector of column names.