Add an option to create links instead of copying

[lastique]

It would be useful to be able to select a number of files and then create symlinks or hardlinks pointing to those files in the directory open in the other panel. This is functionally similar to copying the files, only without actually copying the data.

One way to implement this would be to add a selection UI element to the Copy dialog, which would allow to select between the regular copy, create hardlinks and create symlinks. The regular copy would be the default, of course.

Note that there are also other ways to copy files on some filesystems, like reflinks on XFS and BTRFS. This could be another option in that dialog, but my primary interest is in creating symlinks and hardlinks.

[andrew_b]

Closed as duplicate of #3950.
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