join: Documented that it's case- and punctuation-insensitive.

bin/map: map_table(): Refactored to map simplified to original column names first and then determine column index for each original name, in order to avoid trying to recover the original name from a simplified name where multiple original names might collide onto the same simplified name. Documented that it's case- and punctuation-insensitive.

intersect, union: Made case- and punctuation-insensitive. mappings/Veg+-VegBIEN.csv: Removed no longer needed duplicate entries for each first letter case, which must now be removed for case- and punctuation-insensitive intersect/union to work. Note that the SpeciesLink `svn diff` hides _alt entry 0, which contains one of the removed duplicate columns that appears in the diff.

bin/map: map_table(): Resolve all mappings and prefixes after applying maps.simplify()

inputs/SpeciesLink/Specimen/map.csv: _alt all scientificNameAuthorship synonyms together in one _alt

schemas/functions.sql: _alt(): Added extra numbered parameters. Eventually these will need to be converted to variadic args, but this will require special support from column-based import.

join: Use new maps.simplify()

maps.py: Added simplify()

join: Match terms with non-alphanumeric chars removed

join: Match terms case-insensitively