WIP: Boundary orthogonalization based on source terms

[Gravifer]

No description provided.

[pull-request-quantifier-deprecated]

This PR has 278 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Quantification details

Label      : Large
Size       : +257 -21
Percentile : 67.8%

Total files changed: 3

Change summary by file extension:
.jl : +28 -20
.nb : +229 -1

Change counts above are quantified counts, based on the PullRequestQuantifier customizations.

Why proper sizing of changes matters

Optimal pull request sizes drive a better predictable PR flow as they strike a
balance between between PR complexity and PR review overhead. PRs within the
optimal size (typical small, or medium sized PRs) mean:

• Fast and predictable releases to production:
  • Optimal size changes are more likely to be reviewed faster with fewer
    iterations.
  • Similarity in low PR complexity drives similar review times.
• Review quality is likely higher as complexity is lower:
  • Bugs are more likely to be detected.
  • Code inconsistencies are more likely to be detetcted.
• Knowledge sharing is improved within the participants:
  • Small portions can be assimilated better.
• Better engineering practices are exercised:
  • Solving big problems by dividing them in well contained, smaller problems.
  • Exercising separation of concerns within the code changes.

What can I do to optimize my changes

• Use the PullRequestQuantifier to quantify your PR accurately
  • Create a context profile for your repo using the context generator
  • Exclude files that are not necessary to be reviewed or do not increase the review complexity. Example: Autogenerated code, docs, project IDE setting files, binaries, etc. Check out the Excluded section from your prquantifier.yaml context profile.
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• Change your engineering behaviors
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    • Your PR could be split in smaller, self-contained PRs instead
    • Your PR only solves one particular issue. (For example, don't refactor and code new features in the same PR).

How to interpret the change counts in git diff output

• One line was added: +1 -0
• One line was deleted: +0 -1
• One line was modified: +1 -1 (git diff doesn't know about modified, it will
  interpret that line like one addition plus one deletion)
• Change percentiles: Change characteristics (addition, deletion, modification)
  of this PR in relation to all other PRs within the repository.

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[Gravifer]

Thanks to @chromolakyro's recognition, this indexing syntax is problematic. Should be:

Suggested change

	@inline PwO(u::CartesianIndex) = doBO && u[1] in axes(xs)[1][[begin:begin+1, end-1 : end ]] ?
	@inline PwO(u::CartesianIndex) = doBO && u[1] in axes(xs)[1][[begin:begin+1 end-1 : end ]] ?

this is already implemented by @chromolakyro; he will push later today.