Fixed issue that appeared when trying to remove temporary folder from different file systems #2473
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This PR accommodates fixes an issue that appeared when installing SCT under Singulary container, where a folder located in another file system could not be moved.
The implemented solution is to copy the files (instead of moving them). This PR also includes a few minor improvements, notably by replacing shutil by distutils for copying files to existing directories (not possible with shutil.copytree).
Fixes #2472