Adding config option to open Repls in a different view group

I'd often start up a new Repl with a Clojure file in focus (thus automatically loading its dependencies on startup) just to find the Repl sitting on top of the file I was actually working on. I've therefore added a config option which allows you to set the default opening position of new ReplViews to a specific Sublime Text group index or simply to 'one group down'/'one group to the right'.