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)
abort: Failed to parse .../t/.hg/hgrc
File contains no section headers.
file: .../t/.hg/hgrc, line: 1
'invalid\n'