[plt-scheme] ssl/tls connections

>> I don't yet believe any of this, but maybe it's worth one more try.
> 
> This change does seem to work, so I've committed it to SVN and removed
> the documentation's claim that attempting to read/write puts the port
> in read-/write-only mode.

With some minimal testing, it looks like it works here too (using sync
rather than byte-ready). glad to see the empiricist impulse overcome
belief in this case. ..

thanks again,
nik