posix rename, "renames a file, moving it between directories if required".
pgrename, win32 port uses MoveFileEx, to support rename files at Windows side,
but, actually don't allow "renames a file, moving it between directories if required".
To match the same characteristics as posix rename, we need to add a flag to MoveFileEx (MOVEFILE_COPY_ALLOWED)
Which allows, if necessary, to move between volumes, drives and directories.
Such a resource seems to decrease the chances of occurring, permission denied, when renaming the temporary statistics file.
