Nit: current_chunk_incomplete -> current_chunk_complete

[tbarton16]

As far as I understand,current_chunk_incomplete denotes when the streamer has not finished writing the archives in the dir. It never gets renamed to current_chunk_complete so the user doesn't know when commit() has finished. If I am misunderstanding, please let me know.

[lfoppiano]

@tbarton16 The file gets renamed, but a new one is created every time. So the last one is not cleaned up.