download: Make unzipped files executable. Fixes nf-core/tools#289 #290
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nf-core downloaduses the Pythonzipfilemodule to unzip the downloaded pipeline scripts. This package strips all file permissions, so the files are no longer executable.In this PR, the code just traverses the downloaded files and does a
chmod 775to make them executable. It's a bit like swatting a fly with a hammer, but it should work..x-ref #289