Use underscores instead of dots

[hadley]

Otherwise it looks like you're defining S3 methods

[cscheid]

There's no way to change this without breaking everyone's code, though. Maybe when we find a solution for #29, I'll go ahead and make the breaking change.

(In a related note, do you know how to make ESS not turn an underscore into <-? I know that typing it twice fixes it, but that's still very annoying.)

[soodoku]

Re. 2: http://stackoverflow.com/questions/1816238/how-to-turn-off-auto-replacement-in-emacs-speaks-statistics-for-r

[cscheid]

Closed (wontfix) by #70.