OutputView behavior and usage

[Ivan Shapovalov]

Hi all again,

Recently I've been thinking about OutputViews and their "history support" 
(possibility to view old execution results) - esp. whether it is handy and 
convenient to use history abilities. And here are some points which seem 
inconvenient to me.

1. The MultipleView's behavior of opening a new tab on each job can be pretty 
annoying, especially when the same launch configuration is being ran multiple 
times (debugging, etc).
So I propose the following modification: make the tabs reusable (say, by name) 
+ add an ability to "pin" an arbitrary tab to avoid reusing it.

2. Default view types for standard toolviews could be slightly modified. For 
example, I'd like to make build views MultipleView. Also, if (1) gets 
declined, it would make sense to make run/debug views HistoryView.

If the above gets accepted, the code will, of course, go through regular 
review. I just want to avoid doing unneeded work which will remain unmerged.

Thanks,
- Ivan