Log Message:
Update package to 3.8.1.

Mostly bug fixes from 3.8.

- Use string methods instead of deprecated string functions.
- Only use SQL-standard way of escaping quotes.
- Added the functions escape_string() and escape/unescape_bytea()
  (as suggested by Charlie Dyson and Kavous Bojnourdi a long time ago).
- Reverted code in clear() method that set date to current.
- Added code for backwards compatibility in OID munging code.
- Reorder attnames tests so that "interval" is checked for before \ 
"int."
- If caller supplies key dictionary, make sure that all has a namespace.