[ESS] max lisp eval depth & ESS

[Richard M. Heiberger]

I always use C-c C-n.
It is very fast because both are ctrl keys.
Keyboard commands are normally much faster than shifting the
mouse to some menu somewhere.

The ess-eval functions are on the menu.  From within
a myfile.r buffer, click on the ESS menu item and find them.
The menu item gives the keystrokes as an encouragement to use them.

There is also a toolbar option, which I turned off, that gives
buttons for sending stuff.