schemas/util.sql: added fold_explain_msg()

bugfix: bin/repl: only use excluded_prefix_re/excluded_suffix_re in text mode (used in renaming columns in SQL scripts), to prevent the special coding for column renames from also affecting regular regexp/word replacements

inputs/VegBank/taxon_observation.**/test.xml.ref: updated inserted row count

inputs/run: postprocess(): documented runtime (30 min)

bugfix: inputs/input.Makefile: %/postprocess.sql: don't perform replacements using map.csv, because map.csv is not idempotent. this functionality was only there to facilitate switching to new-style import, which is now largely done. (the remaining datasources NVS, SALVIAS, TEAM contain only 1 postprocess.sql: inputs/SALVIAS/projects/postprocess.sql (`st inputs/{NVS,SALVIAS,TEAM}/*/postprocess.sql`).)

bugfix: bin/repl: text mode: also don't match if it's part of a '-'-separated identifier

bugfix: bin/repl: text mode: also don't match if it's a word in a sentence

bugfix: bin/repl: text mode: turned off the suffix matching, because there are cases where a mapping adds a suffix which would cause the same replacement to be performed repeatedly

inputs/input.Makefile: %/postprocess.sql: always run this, not just if the associated map spreadsheets change, to avoid needing to `touch` them to cause %/postprocess.sql to run

bin/repl: text mode: exclude prefixes that should not cause replacement, to avoid doubling leading *