recognize user:password in URLs that include port numbers.
when giving user/pwd in an URL, eg.
hg pull http://user:pwd@host.com:666/hg/something,
hg would still ask for user/pwd in interactive mode (or fail in
non-interactive)
# should print nothing
# should print ? b/x
? b/x
# should print A b/x
A b/x
# should forget b/x
forgetting b/x
# should print nothing