type = "h" (and possibly others) don't work

[grantmcdermott]

No description provided.

[grantmcdermott]

Also fixed for types "c", "s" and "S".:

Example behaviour after 40a1aee

library(plot2)

plot2(0:10, type = "h")

plot2(mpg ~ wt | cyl, mtcars, type = "h")

plot2(Temp ~ Day | Month, airquality, type = "s")

[grantmcdermott]

One thing we might need to think about, however, is controlled jittering for grouped "h" plots. (You could say the same thing for other plot types with overlap.)

plot2(Temp ~ Day | Month, airquality, type = "h")