normalize line endings with .gitattributes

[achubaty]

The repository had no .gitattributes, and contributors work across Windows, Linux and macOS, so files were committed with whatever line endings the author's editor produced. Three text files had drifted to CRLF while everything else was LF:

• NAMESPACE
• tests/test-all.R
• tests/testthat/test-NetLogoR-classes.R

* text=auto stores LF in the repository and checks out whatever is native, so this stops mattering. Binary types are spelled out so they are never touched, common text types so they are never misdetected.

Reviewing this

The renormalization looks enormous because two files were rewritten end to end, but the only content change is .gitattributes itself:

$ git diff --ignore-cr-at-eol --stat 420a878^ 420a878
 .gitattributes | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

Reviewing with whitespace ignored, or just reading that one file, is enough.

The renormalization commit is listed in a new .git-blame-ignore-revs, so it does not get in the way of git blame. GitHub honours that file automatically; locally it needs git config blame.ignoreRevsFile .git-blame-ignore-revs.

Why now

Mixed endings caused a real failure while rebasing #59. Editing the CRLF test file with a script silently rewrote it as LF, turning an 81-line addition into a 250/169 whole-file diff, and dropped a closing }) — because Python's splitlines() splits on more characters than \n, so line indices computed that way disagree with grep -n. The test suite caught it, but it should not have been possible in the first place.

This was deliberately held until #57, #58 and #59 had all landed, since renormalizing conflicts with anything in flight.

Verification

Checked against a fresh clone of the branch rather than the existing working tree, which is the only way to see what a new checkout actually gets:

• all three files check out LF
• R CMD check --as-cran: 0 errors, 0 warnings, 0 notes

R CMD build already leaves .gitattributes out of the tarball, but it does not exclude .git-blame-ignore-revs — that produced a checking for hidden files and directories NOTE, so it is added to .Rbuildignore.

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