sql.py: Wrapped calls to get_cur_query() that are used as strings in str(), because get_cur_query() can return None

sql.py: next_version(): Versions start from 1, because first existing name was version 0

put_table(): Use short name for temp_suffix now that version # will be added if needed

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