JC paper edits

[jlchan]

Mostly rephrased some sentences and fixed small typos.

Main changes and comments

1. added a paragraph describing Singh + Chandrashekar's paper and how it used Trixi (without us knowing).
2. "However, the code introspection and profiling tools available in Julia make it easier for us to optimize Julia code compared to other languages we are familiar with (having a diverse team with a strong background in C, C++, and Fortran)." What does this mean?
3. added acknowledgments for JC.

[ranocha]

2. "However, the code introspection and profiling tools available in Julia make it easier for us to optimize Julia code compared to other languages we are familiar with (having a diverse team with a strong background in C, C++, and Fortran)." What does this mean?

I wanted to express something like the following.

• The members of our team all have a different background.
• Together, we have a strong background in C, C++, and Fortran.
• Nevertheless, our Julia code is faster than the established HPC Fortran code in this example.
• The reason is not that Fortran or Julia are generically faster (written somewhere around this paragraph).
• In contrast, we expect to be able to get the same performance from either language.
• The code introspection and profiling tools available in Julia are nice.
• Similar tools used to optimize the performance in other languages are usually not as easy to use as their Julia equivalents (if they exist at all).
• Thus, it was easier for us to optimize Trixi.jl

However, it looks like I wrote a sentence that is way too long and not clear enough. Do you have a concise and clear suggestion?

[jlchan]

What about the following? I just took your bullets and fused them into a paragraph.

Together, the members of our team have strong backgrounds in C, C++, and Fortran. Nevertheless, our Julia code is faster than an established HPC Fortran code in this example. The reason is not that Fortran or Julia are generically faster; in contrast, we expect to be able to achieve similar performance from either language. Instead, Trixi's owes its performance optimizations in part to the code introspection and profiling tools available in Julia. Similar tools used to optimize the performance in other languages are usually not as easy to use as their Julia equivalents (if they exist at all).