Implement POSIX.1-1988 UStar support without having to go through GNU tar
Fix the Tar creator for cases where filenames aren't absolute
Tar: predict total archive size and send the header
Fix the size prediction for files where (size%512==0)
Merge branch 'develop' of https://github.com/lrsjng/h5ai into develop
Merge pull request #193 from TvdW/develop

Implement POSIX.1-1988 UStar directly instead of calling the tar binary