Exiv2

Abhinav has reported by email that make testv is reporting errors.

On investigation this is due to changes in the video test files which were made to support Mahesh's GSoC13 video write work. Mahesh's code has not yet been added to the trunk.

I have submitted r3256 which gets make testv to copy the video test files from r3100. This 'fix' is only effective when the video test suite is copied from svn. It's necessary to use rm -rf test/data/video to remove the erroneous test files. make testv will correctly copy r3100 to test/data/video.