Adding Rcpp signature attribute

[traversc]

Pull Request Template for Rcpp

Please explain the changes you want to apply to Rcpp, preferably in an issue ticket before you create a pull request. See the file Contributing and the other templates for details.

Checklist

• Code compiles correctly
• R CMD check still passes all tests
• Prefereably, new tests were added which fail without the change
• Document the changes by file in ChangeLog

[eddelbuettel]

Can you please enable the flag allowing the repo that you sent the PR to to commit in your clone too? I have to push a fix to permit tests to pass.

[eddelbuettel]

Alternatively you can also cherry-pick commit 04d8b03 from the pr/1183 branch I just pushed (and where I permitted myself to rebase and squash you four commits with identical commit message into one).

[traversc]

Added, sorry about that.

[eddelbuettel]

(Took me a moment to realize I needed to force-push as I had rebased. Done now. And then I fat-fingered the close button by accident. Sorry.)

Rev.dep run is progressing but it'll be some time tomorrow that we know more.

[eddelbuettel]

Or maybe my force-push accidentally close this. Sorry. I'm just going to open a new one off the branch where I added the commit.

[eddelbuettel]

#1184 is now in better shape after I arm-wrestled the codecov yaml file so that it no longer flags the PRs as failed on because coverage drops a little.