sql.py: mk_select(): Parse join columns for literal values and table-scoped names as well

mappings/DwC2-VegBIEN.specimens.csv: establishmentMeans: Call _toGrowthform on growthform

schemas/vegbien.sql: Added _toGrowthform

sql.py: put_table(): Changed temp_prefix to a suffix so main name won't be removed if name is truncated

sql.py: mk_select(): fields: Support columns with tables. Changed syntax for literal values so that it wouldn't conflict with new syntax for columns with tables.

iters.py: flatten(): If not an iterable, just return the value

sql.py: put_table(): Pass in_pkeys and out_pkeys to run_query_into() by ref so they will be updated if the table names are changed

sql.py: put_table(): Pass pkeys to run_query_into() by ref so it will be updated if the table name is changed

sql.py: run_query_into(): If CREATE TABLE AS generates a DuplicateTableException, rename the table with a version # prepended

sql.py: run_query_into(): Made into param a reference so that the function can change it, and renamed it to into_ref