dsss net install tango

[Gregor Richards]

Remember how a while ago I said DSSS would never be able to net-install 
Tango?

DSSS can net-install Tango.

Just type `dsss net install tango` and you'll find yourself in 
possession of the latest snapshot.

I've just added the build today, and it appears to work. It's been 
tested to at least a small degree on:
  * GDC + GNU/Linux
  * DMD + GNU/Linux
  * DMD + Windows

The installation of Tango is the only net-installation that requires 
user feedback. Causing Phobos software to become unbuildable is 
something I decided to prompt for :)

Anyway, give it a shot, see if it fails in a spectacular way. Consider 
it a beta installation mechanism for the moment.

  - Gregor Richards