Log Message:
Update xnp2 to 0.83pl20130727.

pkgsrc changes:
- update HOMEPAGE and MASTER_SITES

Upstream changes:

Changes from 20130726:
 X11 dependent part:
  - fix build failure with GTK+ <2.18

Changes from 20120618:
 X11 dependent part:
  - assign F11 key to switch fullscreen and print menu during fullscreen