Added option --make-light-tarball to use symbolic links for data folder #1184
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Option will only work on worker nodes that have /eos mounted. Tested on lxbatch.
Instead of including the content of the data folders into the tarball explicitly, there will be a symbolic link to the respective folders on eos. This reduces the size of the tarball by ~90%, as well as its creation time. The space of the scratch area on the worker node will be reduced drastically as well.