Collision applet changes

Errata to fix

• The mass control slider is too small and slides off the edge.
• Test the applet on machines slower than a dual PPro 200. Maybe the animation isn't smooth. It's already double-buffered and threaded, but it uses lightweight components. Native components may have smoother animation b/c you can set small clipping regions.
• Support more langauges -- I could at least add German.

Versions

Version 1.0 released 22 September 1998.

Fixed time slider size. Added Chinese strings in Unicode. Changed center of mass ball to be smaller and hollow.

Version 1.0b not released as of 17 August 1998.

Waiting for Fowler's approval.