bin/in_place: diff: use --brief to avoid scanning the entire file for large files

bin/in_place: added $preserve_mtime flag

lib/sh/db.sh pg_dump(), bin/pg_dump_vegbien: --format: use the long form of the formats to make the code self-documenting

bin/repl: match as whole-word text (like SQL identifier): documented that this is a generalization of lib/sql_gen.py map_expr() to work on entire source files

bin/repl, lib/sql_gen.py Expression transforming: documented that this can also be done in Postgres with expression substitution (wiki.vegpath.org/Postgres_queries#expression-substitution)

bin/make_analytical_db: removed remake_diff_tables() because this is now done for each datasource in inputs/input.Makefile

bin/make_analytical_db: removed no longer needed "${public}_validations" schema qualifier, now that it is in the search_path

fix: bin/vegbien_dest: added public_validations

fix: bin/repl: text mode (whether all patterns are plain text) should default to on, not off, if matching entire cells in a spreadsheet

fix: bin/repl: don't consider uppercase SQL keywords to indicate that a word is in a sentence