Bug 18674 tools::toTitleCase()

[shannonpileggi]

Bug 18674 tools::toTitleCase() incorrectly capitalizes conjunctions (e.g. 'and') when using suspensive hyphenation corrected.

Also fixed spacing in documentation, added two examples in documentation, and added two tests for the fix.

[shannonpileggi]

fyi @sarahzeller @reikookamoto @Bisaloo

[mmaechler]

Committed to R's sources now, w/ even more examples (+ NEWS + tools-Ex.Rout.save).
Thank you very much!

NB (also to myself!):

1. Appending .diff to the end of the URL automatically provides something you save from your browser as plain text file, named, e.g., toTitleCase_PR-18674.diff and then
2. in R's bugzilla, you'd typically use the Add an Attachment option to add that *.diff file as attachment:
   - on the new Create New Attachment web page, add a Brief Decription ,
   - also click the Content Type: patch box, and then
   - add comments (often prose text) below rather than in the original bugzilla page for the PR.
   - press Submit

This will give you a perfect bugzilla submission, with only one e-mail to all of R-core plus PR author and more listeners.

[MichaelChirico]

Linking here for convenience: https://bugs.r-project.org/show_bug.cgi?id=18674

[shannonpileggi]

Thank you @mmaechler for the detailed instructions and the feedback! I have added an issue to the contribution to guide to assess if we could use more information there.

r-devel/rdevguide#177