Emulation: Emit sequences for Shift+PageUp and friends on alternate screen.

https://bugzilla.gnome.org/show_bug.cgi?id=643233
license: Update to LGPL 2.1. Update FSF postal address.

https://bugzilla.gnome.org/show_bug.cgi?id=619891
https://bugzilla.gnome.org/show_bug.cgi?id=721522
emulation: Support 16 million colors

https://bugzilla.gnome.org/show_bug.cgi?id=704449