input.Makefile: Maps validation: %/new_terms.csv: Include the entire map spreadsheet row, so that each new term is listed together with its mapping. This facilitates adding new mappings to mappings/Veg+-VegCore.csv directly from any new_terms.csv. Note that the use of `sort -u` (in lib/mappings.Makefile) causes multiline comments to be separated, leading to spurious lines for each multiline comment line.