+ Wrote the changelog for the Debian release.
    + Wrote a copyright file.
  * doc/:
    + Wrote manpages for caca-demo and caca-spritedit.
  * examples/caca.txt:
    + Centered the sprite handle.
    + Added a second frame to the sprite.

* two new types of aliens. only one rules.
  * removed gfx_write in favor of gfx_putchar and gfx_putstr.
  * added bonuses at alien death. they do nothing yet.
  * seeker missiles. 'b' to test.
  * weapon resolution is now 16*char. needs to be generalized.
  * fixed the supernova bugs. center could collide with the tunnel, and
    the last frame was badly displayed.
  * lots of cleanups everywhere.