+ Use Space to pause demos, Esc to quit.

+ Bigger metaballs, less metaballs.
    + Rotating palette.
  * examples/cacaplas.c:
    + Slightly decreased speed.
  * examples/cacacirc.c:
    + New effect.

+ Updated credits.
  * NEWS:
    + Forthcoming 0.8 news.

+ Check for -lm.
  * examples/cacaplas.c:
    + New demo, cacaplas, that displays a colour plasma.