ggplot2 0.9.3 released!

[Winston Chang]

Hi everyone -

We're pleased to announce the release of ggplot2 0.9.3! ggplot2 uses the
scales and gtable packages, and there are also new versions of these
packages: scales 0.2.3 and gtable 0.1.2. The source and binary versions
should be available on the CRAN mirrors by now. To get the latest version
of ggplot2 and all its dependencies, start a clean R session and run
`install.packages("ggplot2", dep = T)`.

Most of the changes in this version are bug fixes. Perhaps the most visible
change is that ggplot will now print out warning messages when you use
`stat="bin"` and also map a variable to y. For example, these are valid:

ggplot(mtcars, aes(wt, mpg)) + geom_bar(stat = "identity")
ggplot(mtcars, aes(cyl)) + geom_bar(stat = "bin")

But these will result in some warnings:

ggplot(mtcars, aes(wt, mpg)) + geom_bar(stat = "bin")
# The default stat for geom_bar is "bin", so this is the same as above:
ggplot(mtcars, aes(wt, mpg)) + geom_bar()

The reason for this change is to make behavior more consistent --
`stat_bin` generates a y value, and so should not work when you also map a
value to y.

For a full list of changes, please see:
http://cran.r-project.org/web/packages/ggplot2/NEWS

Regards,

Winston & Hadley