Use Cray-compatible syntax for multi-line string literals

[J-Lentz]

Description
The Cray compiler does not support C-style concatenation of string literals, and therefore, the following results in a syntax error:

print "(A)", "Hello " &
             &"world"

All occurrences of the above syntax have therefore been changed to:

print "(A)", "Hello &
             &world"

How Has This Been Tested?

• Fixes the relevant syntax errors with Cray compiler version 15.0.1 on Gaea
• Builds with Intel compiler version 2024.1.0 on the AMD box

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• New check tests, if applicable, are included
• make distcheck passes

[bensonr]

What happens if you concatenate correctly in fortran using // between the two independent strings.

Print "(A)", "Hello "// &
&"world"

[J-Lentz]

What happens if you concatenate correctly in fortran using // between the two independent strings.

Print "(A)", "Hello "// &
&"world"

That works fine with Cray. It generates identical object code in gfortran and Cray, but interestingly, different object code with ifort.