[turba] table definition w/oci8

[Liam Hoekenga]

For use with oracle, it looks like object_members should be a CLOB instead of a
BLOB (as suggested by scripts/drivers/sql.php).  You can't add people to
distribution lists if it's a BLOB - if you try to insert data into a BLOB w/o
doing the OCIBindDescriptor stuff, you get "ORA-01465: invalid hex number".

There's still that whole "no string longer than 4000 characters" problem, but I
was able to add about 80 addresses to a group, which honestly, I think is an
entirely reasonable number.

Liam