Rename files

[sreekants]

There seems to be no direct way to rename a file using the File object in SD.h. Copying a file is the only other costly hack to do this. This is not desirable.

[sreekants]

As an aside, Is move_file() or soft_link() like capability possible?

[pavelzampach]

I agree this, rename function is missing for my purpose

[pavelzampach]

I've added missing rename function to my fork (pavelzampach)

[k2332k]

@pavelzampach how does rename function works with the library you have provided