Support for IPV6

[emorfaq]

It appears ssh doesn't support ipv6 address scheme. Referring to issue raised on [https://stackoverflow.com/questions/53138493/ssh-ipv6-address-in-r-ssh-package]. Can I hope for added support of ipv6 in near future from developers?

[hrbrmstr]

One idea for how to solve this (though it introduces a dependency on iptools to avoid re-creating the "is this a valid IPv6 address?" wheel) https://github.com/hrbrmstr/ssh/blob/master/R/connect.R#L48-L55 / https://github.com/hrbrmstr/ssh/blob/master/R/connect.R#L86-L95

[hrbrmstr]

Similarly, a further enhancement here: https://github.com/hrbrmstr/ssh/blob/master/src/session.c#L128-L130 / https://github.com/hrbrmstr/ssh/blob/master/R/connect.R#L66-L71 (with associated function signature changes) adds support for supplying a local config file (which is IMO a better way to manage connection parameters). It's only been implemented for the main connect function as I didn't want to assume how folks want the ultimate idiom to work.