Fix notice.
Improve BLOB/CLOB handling.

Add Horde_Db_Value_Text and updateBlob().
Fix insertBlob() returns.
Fix Horde_Db_Adapter interface.
Use the same db schema table names like Horde_Core.

Using different schema names doesn't protect against accidental data loss or
something, because we use the same library table names anyway. But using
different schema names *does* cause inconsistency errors when running unit
tests and test Horde installs on the same database.
Allow $where to be specified as bind parameters.
Use BLOB/CLOB support from Horde_Db.
Don't search event that we just removed.