fix: schemas/util.sql: derived_col_update(): column comment: formula: put on own line to support multiline exprs

bugfix: schemas/util.sql: derived_col_update(): column comment: need to use expr from DB, not as provided by user, to avoid this changing when derived_col_update() is rerun

inputs/.TNRS/schema.sql: taxon_match: added derived columns scrubbed_*

bugfix: schemas/util.sql: derived_col_expr_from_check_constraint(): need to handle strs with \n after IS DISTINCT FROM

inputs/.TNRS/schema.sql: taxon_match: put matched-taxon derived columns before accepted-taxon derived columns

inputs/.TNRS/schema.sql: taxon_match: added derived column "[matched_]species[_binomial]~(Accepted_)__@TNRS__@vegpath.org"

inputs/.TNRS/schema.sql: _matched_has_accepted: renamed to matched_has_accepted because the leading _ did not create vertical alignment anyway, due to different quoting syntaxes

schemas/util.sql: added derived_col_name_from_check_constraint()

schemas/util.sql: derived_col_update(): add steps to rename column

web/username_prefix.php: transposes: removed recommendation for vertical alignment because different quoting syntaxes, etc. make it difficult to have a consistent alignment anyway