New object types are now added to DB_ENV->set_memory_init,
allowing a user to account for replication's environment region memory needs.
DB_MEM_DATABASE
Initialize the number of databases in the environment.
DB_MEM_DATABASE_LENGTH
Initialize the maximum combined length of a database's directory and name strings.
DB_MEM_EXTFILE_DATABASE
Initialize the number of databases and subdatabases using external files.
DB_MEM_REP_SITE
Initialize the maximum number of sites in the replication group.