lib/sql_gen.py: map_expr(): documented that unlike bin/repl SQL identifier handling, this does simplify the resulting expression

lib/sql_gen.py: map_expr(): documented that this is a special case of bin/repl SQL identifier handling which does not handle entire source files

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)

fix: inputs/U/Specimen/map.csv: Genus: remapped to taxonName because this field is actually mislabeled in the original column names

validation/aggregating/pipeline/validations_on_sparse_datasources.odg: not applicable "✓": increased font size so the size of the character matches the surrounding text

validation/aggregating/pipeline/validations_on_sparse_datasources.odg: removed = lines for each input query, because they clutter up the diagram and the "same, so don't need to rewrite" message now shows this as well

validation/aggregating/pipeline/validations_on_sparse_datasources.odg: added the denormalized VegCore schema approach for comparison, as requested by Mark

schemas/vegbien.sql: remake_diff_tables(schema text): removed bien2_traits runtime because this applies only to one datasource. the bien2_traits runtime is now documented in inputs/bien2_traits/run.

inputs/NY/run: `make inputs/NY/validate`: updated runtime (6.5 min). this increases as more queries are able to run successfully.