XOVER Support

[kevingy]

The Usenet server that I am using does not support the OVER command. It only supports the older XOVER command. For backwards compatibility, perhaps this library should also support XOVER. The syntax is identical to OVER, except for the additional X in XOVER.

I've already coded XOVER by copying OVER and adding the X. There is certainly a more elegant way to implement XOVER without copying the entire method. If this is something valuable to the project, I will create the more elegant solution and create a pull request.

[seanmcelroy]

I'd be happy to take a PR. Is the server publicly accessible? I'd like to dig in a little deeper to understand other features in its capabilities that may also need to be mapped.

[kevingy]

It is a commercial server - astraweb.com. XOVER is an older method from 2000. The X specifies an extended or experimental method. XOVER was replaced by OVER IN 2006, but XOVER is still widely used.