IO-500 tag for SC19

updated news

Version of IO-500 for ISC-HPC 2019

Merge pull request hpc#121 from glennklockwood/rc

cherry-pick solution to hpc#119 into rc branch

Merge pull request hpc#121 from glennklockwood/rc

cherry-pick solution to hpc#119 into rc branch

updated NEWS for final contributions to 3.2 release

prep for tagging 3.1.0

Prep for tagging 3.0.1

Prep for tagging 3.0.0.

Prep for tagging 2.999.5