We can now use YAML instead of JSON, which is much nicer for jobs with complicated scripts. There's no longer a need to redirect to runsim.sh because the contents of runsim.sh can comfortably live in the job configuration file itself.
The user no longer needs to create an instance template and point the Batch job at that template, in order to get a boot image based on the HPC CentOS 7 image. Instead the job spec can use the boot image shortcut "batch-hpc-centos" to get an image based on HPC CentOS 7, and with the Batch agent preinstalled.
We can now use YAML instead of JSON, which is much nicer for jobs with complicated scripts. There's no longer a need to redirect to runsim.sh because the contents of runsim.sh can comfortably live in the job configuration file itself.
The user no longer needs to create an instance template and point the Batch job at that template, in order to get a boot image based on the HPC CentOS 7 image. Instead the job spec can use the boot image shortcut "batch-hpc-centos" to get an image based on HPC CentOS 7, and with the Batch agent preinstalled.
Other minor cleanup, rewording.