What's the difference between an "R Project" and "R Package Project" in Eclipse StatET?

It seems the Eclipse R add-on StatET, has two difference kinds of R Projects. What are the differences between these two?

Solution

This is a new type of a project, useful when you're debugging your package from source (as of late, StatET has debugging capabilities, too). See some comments from the author of StatET from about a month ago.

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