Add camera clock offset computation

[Robert Helling]

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Hi,

here are two patches to help the user to figure out the correct time offset between his dive computer and his camera. This works by taking a picture of the dive computer displaying the current time and then pointing subsurface to that image (in the dialog to set the offset). The image is shown as well as the EXIV time which can then be adjusted to the time shown on the image (as of the dive computer). The offset is computed from that and memorized for further picture imports.

Best
Robert

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Robert C. Helling     Elite Master Course Theoretical and Mathematical Physics
                      Scientific Coordinator
                      Ludwig Maximilians Universitaet Muenchen, Dept. Physik
                      Phone: +49 89 2180-4523  Theresienstr. 39, rm. B339
                      http://www.atdotde.de

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