Enabling compression on socket send/receive.

[void09]

I am trying to write a NNTP client for nim, for some reason this basic ancient 
protocol is not implemented in any lib I could find. NNTP protocol allows for 
gzip or deflate compression. I know an if boolean for every send is not a big 
deal, but if it can be done better, by swapping assigned procs in the object, 
why not. It's also much cleaner and logical code. So please assist with this. 
Problem might come from bad syntax, or some complication from generics or 
multisync.