WIP: Only append -bind-to none if it is not already present in MPIEXEC_PRE…

[keadyk]

…FLAGS

Background

• Running cmake . without blowing away causes "-bind-to none" to be appended to MPIEXEC_PREFLAGS over and over again (I was up to 8 repeats in my local build before I noticed!)
• I don't know if this is the "right" solution, but it seems to work.

Purpose of Pull Request

• detail 1, refs Enable travis CI #2 (github number)
• detail 2
• Fixes Redmine Issue #3

Description of changes

• item

Status

• Reference:
  • Pre-Merge Code Review
  • CDash Status
• Checks
  • Travis/Appveyor CI checks pass
  • Code coverage does not decrease
  • Valgrind test passes
  • Toss3 checks pass
  • Trinitite checks pass
  • Code reviewed/approved, sufficient DbC checks, testing, documentation

[keadyk]

@KineticTheory If this is a reasonable solution I can add it in the other places this pattern appears - if not, let me know!

[keadyk]

Hahaha, never mind @KineticTheory, I see this fix was added to your last PR. The nice thing for me is that we fixed it in the exact same way! I am heartened :D

[KineticTheory]

Sorry about that bug. I'm not sure how we missed it for so long. Since the regressions build from scratch, they didn't catch the issue.