GitLab

- set $HOME to avoid perturbing ~/ config files for the user running this script
- remove deprecated --dirty and LD_PRELOAD hacks
- remove explicit set of SPACK_ROOT in favor of variable set by spack itself
- other misc streamlining improvements

- build and run against mvapich with verbs support
- use newer gcc
- don't do dirty builds

- fastest config is 4 rpc handler threads, pipelining, on socket 2

- also rename some scripts and email headings for consistency