Make the position specification in tests more compact

[markdewing]

Use a brace initializer to put 3 coordinates on one line. This makes the setup part of tests more compact.

The change was using a Comby script.

The change described in a file replaceR.toml:

[01-changeR]
match='''
:[[name]].R[:[idx]][0] = :[pos0];
:[[name]].R[:[idx]][1] = :[pos1];
:[[name]].R[:[idx]][2] = :[pos2];
'''
rewrite=" :[[name]].R[:[idx]] = {:[pos0], :[pos1], :[pos2]};\n"

Applied with: comby -config replaceR.toml -matcher .c -i -d /home/mdewing/nvme/physics/codes/qmcpack/tmp/qmcpack/src/QMCWaveFunctions/tests

Followed with clang-format to fix up the formatting.

This change only affects the QMCWaveFunctions tests, to keep the PR smaller. If this PR is okay, I can repeat it for other test directories.

What type(s) of changes does this code introduce?

Delete the items that do not apply

• Code style update (formatting, renaming)

Does this introduce a breaking change?

• No

What systems has this change been tested on?

desktop

Checklist

Update the following with a yes where the items apply. If you're unsure about any of them, don't hesitate to ask. This is
simply a reminder of what we are going to look for before merging your code.

• Yes. This PR is up to date with current the current state of 'develop'
• Yes. Code added or changed in the PR has been clang-formatted
• No. This PR adds tests to cover any new code, or to catch a bug that is being fixed
• No. Documentation has been added (if appropriate)

[ye-luo]

Cool. I learned a new tool.

[prckent]

Cool.

Useful readability improvement in the reformatted code. Makes me wish clang-format did a better job with sets of numbers on multiple lines (e.g. matrices) and would align the entries by the decimal point.

Did not know about comby. Wish it knew about CMakeLists.txt for test value updates.

[markdewing]

Test this please