Workaround for long exposure bug in PiCamera v1.13

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I wanted to see how my robot will fare when I turn out the lights on him, so I set up a long exposure capture method. I ran my test and captured a long exposure image just fine, but the camera.close() hung, which requires a reboot to clear. (Even got a python Segmentation Fault after killing the first run and rerunning it.)

There is a workaround:

    # bug in picamera https://github.com/waveform80/picamera/issues/528
    camera.framerate = 1    # workaround
    sleep(2)                             # workaround
    camera.close()

Now Carl can see in the dark with 6 second exposures.
(I’m going to get a little night light for him too, so he won’t be afraid of the dark anymore.)

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