faster copy

[tkhyn]

Original report by Anonymous.

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a faster file copier than shutil.copy might be used for win32 platforms. eg. copyx or robocopy.

[tkhyn]

Hi again, I'm not sure that making a subprocess call to robocopy or copyx to copy the files one by one would be any faster.

I'm not using dirsync much these days and have little time to dedicate to its improvement, so feel free to do some testing / profiling and submit a PR!