R-alpha: Some name changes

[Ross Ihaka]

I would like to raise the possibility of some function name
changes.  For compatibility with S it might be good to change

	"dotplot" to "dotchart"
	"piechart" to "pie"

(are there any others?).  Is either of these a good idea?
(I would actualy like to change "piechart" to something
like

	piechart.use.this.function.and.you.will.catch.ebola

to discourage people from using it, but perhaps sneaking
a segmentation violation into the code will do the trick :-)

We could also replace "save.plot" and " print.plot" by a
single function

	hardcopy(file, printcmd="lpr")

which would work as follows:  If "file" is specified, the
onscreen plot is saved as encapsulated postscript (or whatever
the platform standard is), otherwise the postscript is piped
to the command specified by printcmd.  This would replace
two commands with one.

Even when multiple active devices happen (soonish???),
I think that having a command like this would probably be
useful.
	Ross
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