Update config tutorial section to 1.0

[scheibelp]

• Right now just the compilers part and intro are updated everything up to the "Installation Permissions" section is updated (I don't anticipate any major edits in that section or any after)
• For intro:
  • overrides (::) use config: section as example
• For compilers
  • Compilers are in the packages: section
  • And some attributes have moved around inside of it (but generally look the same)
  • can't set target in the compiler entry anymore
  • Toolchain example is added for hybrid compiler
• Packages:
  • concretization examples updated (they are all different because e.g. compiler modeling)
  • preferences for compilers is done differently now (I use require: Update August 4: I'm now using prefer: and later on using require for hdf5~mpi, which is smoother overall)
  • concretizations for hdf5+mpi ^mpich@4.0 weren't quite the same, so I truncated that part and emphasized the error message (vs. intermediate step where you concretize and don't see hdf5+mpi)
• A couple examples that installed things have been updated to just call spack spec (pending updates to tutorial image)

[becker33]

In the first bit where we cover the sections of the available config, we should remove the compilers section since it's deprecated. Around line 27 in the rst file.

It would be great if we could find time/space for an include example, but I don't know what the changes have done to the timing so I don't know if that's possible. It might be more valuable than some of the stuff in the "high level config" segment but that doesn't mean we have time to make that happen for the HPCIC tutorial.

[becker33]

Why are we adding this? Wouldn't this make it impossible to use our new toolchain (because it requests some of each)?

I think it would be truer to the original intent of the example to set

all:
  prefer:
  - %clang_gfortran

[scheibelp]

This doesn't seem to work for me when I test it out (doesn't seem to encourage use of the toolchain, or hybridizing the clang/gcc compilers)

I did run through the whole tutorial with one_of, and I agree I'm not clear why it ends up allowing mixing (a bug maybe), but anyhow

• Replacing it with any_of worked for me
• And I think that ought to fit with what we intend

Have you used a preference for a toolchain before?

(trying prefer: [%clang_gfortran] also appears to significantly increase concretization times)

[scheibelp]

I retried this with prefer: [%llvm] and it went better, so that's what the tutorial looks like now