Release 4.5: DB->set_isalive

In previous releases, the function specified to the DB_ENV->set_isalive() method did not take a flags parameter. In the Berkeley DB 4.5 release, an additional flags argument has been added: DB_MUTEX_PROCESS_ONLY.

Applications configuring an is-alive function should add a flags argument to the function, and change the function to ignore any thread ID and return the status of just the process, when the DB_MUTEX_PROCESS_ONLY flag is specified.