bugfix: schemas/util.sql: set_col_names(): need to generate error if destination column already exists (rather than suppressing it with try_create()), because this indicates a collision

bugfix: inputs/Madidi/IndividualObservation/map.csv: removed derived column FieldFamilyFullName#originalFamily, which should not be in the map table because it can contain only columns that are initially in the table before running postprocess.sql

schemas/util.sql: map table: added unique constraint on the to column as well, because the destination names also need to be distinct in order to be a valid set of column names

schemas/util.sql: map table: changed pkey to a unique constraint so pgAdmin would sort the entries in table order (matching the order they are in the staging table) instead of alphabetized by the pkey

bugfix: inputs/REMIB/Specimen/map.csv: state: changed output column name to stateProvince_verbatim to match the renaming in postprocess.sql

inputs/REMIB/Specimen/postprocess.sql: remove frameshifted rows: removed out-of-date rerun time, which applied to doing all the deletes in the same statement (however, the current rerun time is approximately the same). note that index scans are not actually used (as the previous comment incorrectly stated) because the conditions for this filter are prefix-less regexps.

inputs/REMIB/Specimen/: translated single-column filters to postprocessing derived columns, using the steps at wiki.vegpath.org/Switching_to_new-style_import#stage-I-source-specific > "translate single-column filters to postprocessing derived columns". null-mapping filters now use wrappers around new util.map_nulls(). note that the verbatim columns input to the filters need to be renamed to avoid name collisions with their filtered columns, which must be VegCore terms for new-style import.

inputs/REMIB/Specimen/postprocess.sql: remove frameshifted rows: also filter out non-numbers for long_sec, lat_min, lat_sec

inputs/REMIB/Specimen/postprocess.sql: remove frameshifted rows: remove rows where long_min is not a number

inputs/REMIB/Specimen/postprocess.sql: change E'' to regular '' to avoid the need to double \ (instead ' would be doubled). E'' used to be necessary in previous versions of PostgreSQL to avoid a warning about escape string syntax.