Database Purge; changed so only Account Purge requires an Access Database opened in Exclusive mode

The Database Purge has been changed so only the "Purge Accounts" option requires an Access Database to be opened in Exclusive mode.

Note, it is still best to purge the database whilst it is opened exclusively.

Note, if the Purge fails with a file locking error you may need to try again with the database opened in exclusive mode.