Add function for checking whether files exist
Close SQLite sockets properly on failure
Add support for bootstrapping sqlite databases
Add schemas and support files for IP allocation for SQLite
Mark sqlite as stable
Rename sql_init_socket to sql_socket_init
Make close method optional
Use talloc destructors to close sockets (db2)
Use talloc destructors to close sockets (firebird)
Use talloc destructors to close sockets (freetds)
Use talloc destructors to close sockets (iodbc)
Use talloc destructors to close sockets (mysql)
Use talloc destructors to close sockets (oracle)
Use talloc destructors to close sockets (unixodbc)
Use talloc destructors to close sockets (sybase)
Use talloc destructors to close sockets (postgresql)
Use talloc destructors to close sockets (SQLite)