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A list of things that could / should be implemented, sorted in no
particular order:

* Change all floats to doubles.  The reason is that on today's
  hardware there won't be any performance difference, and I won't have
  to suffix everything maths related with 'f's.

* See to that the gtk-example gets turned into a tar-file and
  installed in /usr/share/doc/libbubblemon.

* Now that the color intensity is a float, the internal color
  intensity should go from 0.0f to 1.0f.

* The bottom growth should be replaced with something that grows like
  a plant and looks like a plant.

* The bottom growth should move with the water.
