Saving and Restoring State
 --------------------------

  The state of the world (at least for ASpringies) includes all of the
masses and springs, as well as the system parameters.

  By selecting "Restore"  from the  "State"  Menu,  the the previously
saved  system state  is  restored  (if no previous save was made,  the
initial state is used).

  By selecting  "Snapshot", the current system state is saved. This is
useful for temporarily saving  a system configuration  that you do not
feel like setting  up again (or  saving  to  a  file), that you  might
disturb with experimentation.  If you break it, you can "Restore"  any
number of times you like.

  "Reset" sets ASpringies back  to its initial configuration.  All the
masses and springs are removed, and the default system  parameters are
used.

  Selecting either "Restore" or "Reset" will also turn animation off.