Log Message:
Updated package to latest version, 4.0.5. Changes include:

Changed default configuration setting for loadable extensions
 on Mac OS X.  Due to frequent installation issues the default
 setting is now to turn off loadable extensions on that platform.
 You will have to explicitly turn them on if you need them.

Fixed a bug finalizing user-defined functions for a database.

More build process improvements for Homebrew users.

 Improved build process for Homebrew users.

Major API change that is compatible with major release series 2:
 It is now possible to return errors from user-defined SQL-functions
 by simply raising (arbitrary) exceptions.  This somewhat
 tricky internal change eliminates the need for Data.ERROR and
 reestablishes compatibility with major release series 2.
 Sorry for the churn, but the more elegant solution was not
 quite obvious!

Added user function error handling (major API change).

Fixed a build problem due to Oasis/ocamlbuild inconsistency.

Fixed a callback locking bug when encountering rows containing
 unexpected NULLs.