Don't use print, use addstr.  When/if we have var args, maybe I put this back.
(Or maybe I add a number of variants accessed via templatized forms?  Hmm.)
Fixed some bugs in the ncurses wrapper module.

These bugs were exposed by hello5, an example adapted from:
  http://www.tldp.org/HOWTO/NCURSES-Programming-HOWTO/printw.html.
Updated to build with latest Rust master.