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photobox V2
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This project uses a DSLR camera and a small C program to create simple photobox.
The pictures are uploaded to a Dropbox account with cURL
but could also be uploaded to any webserver or send by email.
The progam runs on a Raspberry Pi 3  with a touchscreen and a big emergency
button.

External libraries:
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        - GTK+, GDK, GLib (https://www.gtk.org/): GUI
        - libgphoto2 (http://gphoto.org/proj/libgphoto2/): communication with
        the camera, taking and saving pictures
        - libcurl (https://curl.haxx.se/libcurl/): uploading pictures to Dropbox
        - libqrencode (https://fukuchi.org/works/qrencode/): creating the QR code
        - mipea (https://github.com/jasLogic/mipea): detecting the button presses
        on the GPIO