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I've gone through everywhere we handle host names / addresses (on command lines, in PuTTY config, in port forwarding, in X display names, in host key storage...) and tried to make them handle IPv6 literals sensibly, by using the host_str* functions I introduced in my previous commit. Generally it's now OK to use a bracketed IPv6 literal anywhere a hostname might have been valid; in a few cases where no ambiguity exists (e.g. no :port suffix is permitted anyway) unbracketed IPv6 literals are also acceptable. [originally from svn r10120]