FileHandle.size() does not work well for large file(more than 3.9GB)

[Gabirel]

FileHandle.size() use unsigned int to return the size of the file, which only has 4,294,967,295.

Not enough for larger file.

[scheibel]

Thanks for pointing this out. I added a new branch with a proposed change to the interfaces and member variables.

[lppinto]

Is this going to be committed to master soon?