use zip for image download as default #177
Merged
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Currently the images are downloaded individually by default. This is slow.
This pull request replaces this behavior by downloading the zip file for the imageset instead. This works significantly faster (in my experiments).
Currently the other method for downloading is still included in the download script, in case the zip download does not work. This way it is just a single line to replace to go back to the previous behavior.
Closes #159