Use "DTAR_IDX" as a magic value for dtar index file format to be more specific.
Update dtar man page to discuss known limitations.
Move function that divides a count evenly across ranks to mfu_util
Add option to mfu_param_path_set to control whether it prints a warning for missing paths. This is useful since destination items often do not exist, but that's not a problem for many tools when they create the destination.
Promote dtar from experimental to production tool
Rename --blocksize to --bufsize since block and chunk were too similar
Decrease bufsize and chunksize from 64MB to 4MB. We used to be at 1MB, so 4MB is still an improvement. 64MB was found to be sluggish in response time when printing periodic progress messages.
--blocksize
to--bufsize
since block and chunk were too similar