bugfix: inputs/*/*/postprocess.sql: made all operations idempotent, so that postprocess.sql can be run repeatedly (e.g. by new-style import)

schemas/util.sql: create_if_not_exists(): also suppress "multiple primary keys are not allowed" error

added inputs/newWorld/iso_code_gadm/.map.csv.last_cleanup

inputs/*/Source/VegBIEN.csv: regenerated for new-style import, which uses a symlink to mappings/VegCore-VegBIEN.csv instead of a custom mapping using the original column names

inputs/input.Makefile: Staging tables installation: %/install: run %/map_table at end to rename the staging table columns for new-style datasources

inputs/input.Makefile: Staging tables installation: added %/map_table to run the new-style import staging table renaming

inputs/bien2_traits/TraitObservation/map.csv: removed no longer needed mappings of dummy columns to OMIT, which were creating an unnecessary collision of staging table column names

inputs/bien2_traits/bien2_staging.schema.sql: regenerated from MySQL version so that dummy columns (which used to be generated by bin/my2pg) will be replaced with dummy CHECK constraints instead. this avoids needing to map several dummy columns all to OMIT, which was creating an unnecessary collision of staging table column names.

bin/my2pg*: keep MySQL indefinite dates as text strings instead of translating them (to the first of the month or year) to fit into a PostgreSQL timestamp. this allows the application to decide how to handle these values, which otherwise have no corresponding value in PostgreSQL. this requires changing the date/time related types to text instead of leaving them as-is, so that they can store the custom MySQL strings.

planning/timeline/timeline.2013.xls: Geoscrubbing: made it a subtask of Adding derived columns. moved it to July so that it can be run for Naia's new project.