log_flags.cpp

    and <unsigned_apps_ok> config option.
    This tells the client to allow unsigned apps.
    For testing.
    No file xfers or other network traffic will be allowed if set.
- client: add <exit_after_finish> option (same as cmdline flag)
- client: add <skip_cpu_benchmarks> option (same as cmdline flag)
- client: print message if abort past-deadline unstarted job
- client: improve message when have NVIDIA drivers but no GPU
    

svn path=/trunk/boinc/; revision=19276