Handle no_index as a parameter to provides()

[Leont]

Currently the provides method doesn't implement no_index, which means it can't produce a provides like PAUSE would have indexed it.

[karenetheridge]

What should it put in no_index? no_index isn't really required.. if a private package isn't in provides to begin with, it's not indexed anyway.

[Leont]

Sorry, I was being quite unclear. I meant no_index as an argument, not as an end-result.