sql.py: tables(): Use select() instead of a custom run_query() to avoid using params, which will be deprecated to make it easier to support old versions of Python

schemas/postgresql.nimoy.conf: shared_buffers: Fixed syntax error where decimals were not supported

sql.py: truncate(): Re-added support for string tables using sql_gen.as_Table(). This fixes empty_db(), which relied on this functionality.

sql_gen.py: as_Table(): Added schema param to use as default schema

inputs/SALVIAS: Switched to using CSV exports of the DB, so that staging tables could be created for column-based import

sql.py: run_query_into(): Added add_indexes_ param which causes the function to add indexes on the created table

sql.py: create_table(): Use new add_indexes()

sql.py: Added add_indexes()

sql.py: get_cur_query(): Fixed bug where strings.ustr() needed to be used instead of str() when ensuring that get_cur_query() returns a string

sql.py: cast(): Removed conditional checks for save_errors, since it's now always true if the function got passed the `not save_errors` special case