pmerge needs to notify user when etc-update needs to be run

[agaffney]

The summary says it all.

[ferringb]

Personally, I'm not much for doing a scan of all directories after merging is complete like portage/paludis does; we know up front if we created any collision-protect files, any arguement against having it notify if *new* config updates were created?

In other words, if you're a lazy SA and you have 10 updates sitting, it won't notify you of that till pkgcore creates another one.

Counter args? It's not exact portage behaviour, but imo it's a bit more useful.