[ESS] Open help in new buffer, but not in a new frame

[Rodney Sparapani]

Vitalie Spinu wrote:
> BTW, I believe almost everyone would like to have the new
> 'ess-help-pop-to-buffer set to t by default. Though nil is consistent
> with emacs help display, R help files are much longer and usually don't
> fit in one screen. So it make sense to pop into them during the
> display. Shall I make it the default?
> 
> Vitalie.

+1