[Rd] Methods package is now attached by default

[Jeff Gentry]

> The current r-devel (aka R 1.7.0) now attaches the package "methods" by
> default at startup.

There's either a problem here or something is wrong on my end as I just
did a rsync to R-devel and the build bombed out with:

gcc -shared -L/usr/local/lib -o methods.so do_substitute_direct.o
methods_list_dispatch.o method_meta_data.o slot.o class_support.o tests.o
-L../../../../bin -lR
../../../../library/methods/libs/methods.so is unchanged
make[5]: Leaving directory `/home/jgentry/R-devel/src/library/methods/src'
make[4]: Leaving directory `/home/jgentry/R-devel/src/library/methods/src'
make[4]: Entering directory `/home/jgentry/R-devel/src/library/methods'
dumping R code in package 'methods'
initializing class and method definitions now ...Error in
setClass("VIRTUAL", sealed = TRUE, where = envir) : 
	"VIRTUAL" has a sealed class definition and cannot be redefined
Execution halted
make[4]: *** [../../../library/methods/R/all.rda] Error 1

-Jeff