Update build instructions

[Angelyr]

-Updates SCOREC instructions to work on RHEL9
-Combines build scripts into one and moves options to environment file

[cwsmith]

Looks good. I have one small edit. Would you like me to test the instructions?

update: Checkers has an Ampere GPU. Sorry for the confusion with the edit 'suggestion'.

[Angelyr]

@cwsmith Yes that would be helpful. I've tested all four builds and it should work, but maybe there is something confusing in there.

[cwsmith]

OK. I'll give it a shot and keep you posted. Which SCOREC system(s) did you test on?

[Angelyr]

I've only tested on checkers

[cwsmith]

The build and tests worked as expected on checkers.

A few notes for the polympo section:

• I think moving the clone command to the top of the section is a bit more intuitive.
• IS_TESTING -> BUILD_TESTING ? CMake warned that IS_TESTING was ignored.
• CMake warned that CMAKE_Fortran_COMPILER was ignored for the cws/pumipicDps branch. Is it used for other branches?

[Angelyr]

• I moved the clone command to the top
• I am not getting this warning. You can see the option here:

  polyMPO/CMakeLists.txt

  Line 48 in 8c78cda

  option(IS_TESTING "Build for CTest" OFF)

• I'm not getting this warning either. But I added the CMAKE_Fortran_COMPILER because I was having an issue on perlmutter where the it was using multiple fortran compilers.

[cwsmith]

Sounds good.

I was on the wrong polympo branch. Sorry about that.

I'll merge this if you are all set.