Replace the .Names argument with names in the call
to structure(), addressing the NOTE introduced in R-devel
r90251.
Minor documentation fixes.
Remove omegahat.net from URL checks and network-accessing
examples, since it's unclear whether the new domain owner can be
trusted. Offline references still remain.
Harden the examples against network access problems. Impose a
limit of 20 redirects in url.check(), but rely more on
tryCatch.
Silence an rchk warning.