Set file upload to inherit permission of parent directory

Hi @jeff.ohrstrom. Picking this up from my colleague…

Your assumption is correct, users uploading files do not have the necessary permission to chown to the group, which is intended.

Based on the findings from another recent issue
(File upload and posix acl support - updated)
related to FileUtils.mv versus FileUtils.cp, for the handle_upload function in posix_file.rb, I’ve achieved the desired behavior by enabling setgid on all home directories and switching mv to cp.

What are your thoughts on this approach?