Merge remote-tracking branch 'remotes/kraxel/tags/pull-ui-20151103-1' into staging

ui: fixes for vnc, opengl and curses.

# gpg: Signature made Tue 03 Nov 2015 09:53:24 GMT using RSA key ID D3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>"
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>"
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>"

* remotes/kraxel/tags/pull-ui-20151103-1:
  vnc: fix bug: vnc server can't start when 'to' is specified
  vnc: allow fall back to RAW encoding
  ui/opengl: Reduce build required libraries for opengl
  ui/curses: Fix pageup/pagedown on -curses
  ui/curses: Support line graphics chars on -curses mode
  ui/curses: Fix monitor color with -curses when 256 colors

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>