[issue13968] Support recursive globs

[Yuval Greenfield]

Yuval Greenfield <ubershmekel at gmail.com> added the comment:

I found this comprehensive description of the '**' convention at http://www.codeproject.com/Articles/2809/Recursive-patterned-File-Globbing that can translate directly to unittests.

I'd like to fix the patch for these specs but should it be in a new rglob function or in the existing glob.glob()? I think it should be a new one to avoid any edge-case compatibility concerns even though on face value there shouldn't be any.

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