boinc_api.cpp

    This exits the app with status zero and no finish file,
    so the client will restart it.
    It creates a file "temporary_exit" containing dt.
    The (new) client reads this file and will postpone
    scheduling the job again for dt seconds.
    Old clients will treat it as a premature exit,
    and potentially try to reschedule the job immediately.

    This function is intended for GPU applications that
    fail to allocate GPU RAM,
    presumably because a non-GPU application has it allocated.
    We don't want the job to fail,
    and we want to wait for a while before trying the allocation again.

svn path=/trunk/boinc/; revision=19879