silent option for library function

[Vincent J. Carey, Jr.]

would it be possible to add an option to library that
prevents messages except when there are errors?  as
we build Sweave documents illustrating package functionalities
it is sometimes desirable to attach a package "behind
the scenes".  packages that have messages emitted
in .First.lib (often describing version or developer)
frustrate this particular desire.  verbose=FALSE
does not accomplish this.

note that i have no objection to messages produced by
default use of library.  i just want the ability to
suppress them when there are no errors.  currently
it is possible to do

sink(file="/dev/null")
library([e.g. affy])
sink()

but that may suppress too much -- an error message may be
lost.
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