lib/sh/util.sh: added dp(), which debug-prints a message

bugfix: inputs/VegBank/plot/postprocess.sql: use CVS.plot_ instead because that has the renamed staging table columns, and is compatible with auto-renaming of the SQL script columns

inputs/CVS/plot_/postprocess.sql: add unique constraint on locationName (analogous to the unique constraint in plot), for use by inputs/VegBank/plot/postprocess.sql in removing inter-datasource duplication

fix: schemas/util.sql: explain2notice_msg(): don't include EXPLAIN output for simple, single-value queries, to avoid cluttering up the log output

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