[Rd] Bug 16719: kruskal.test documentation for formula

[Thomas Levine]

I submit a couple options for addressing bug 16719: kruskal.test
documentation for formula.
https://bugs.r-project.org/bugzilla3/show_bug.cgi?id=16719

disallow-character.diff changes the documentation and error message
to indicate that factors are accepted.

allow-character.diff changes the kruskal.test functions to convert
character vectors to factors; documentation is updated accordingly.

I tested the updated functions with the examples in example.R. It is
based on the examples in the bug report.

If there is interest in applying either patch, especially the latter,
I want first to test the change on lots of existing programs that call
kruskal.test, to see if it causes any regressions. Is there a good place
to look for programs that use particular R functions?

I am having trouble building R, so I have so far tested these changes
only by patching revision 74631 (SVN head) and sourcing the resulting
kruskal.test.R in R 3.4.1 on OpenBSD 6.2. I thus have not tested the
R documentation files.

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