Deal with duplicate files last when combining folders

See this post: https://plus.google.com/u/0/+GabrielPerren/posts/VbXhrpFxdeh

When merging/combining two folders or when several files are pasted into a folder, if a duplicate file is found mid-way through the process, it stops until the user intervenes to decide which action to take.

The file manager should be smart enough to skip the conflicting file(s), copy/move all files that can be copied/moved and leave the file(s) with issues for last.

This way if lots of files are being copied/moved the process can finish much faster since the conflicting file(s) will be "bundled" and can be managed last instead of stopping the entire process.

Bounty: https://www.bountysource.com/issues/7004029-deal-with-duplicate-files-last-when-combining-folders

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