Saving and Loading Files
 ------------------------

  The  system state can be saved to and loaded from  files.  The files
are entered  via the standard system  file requester (ASL  or whatever
you patched it into).  For consistency, the filenames should terminate
with ".xsp".   When  a  file is  loaded or  saved, this  extension  is
automatically added if not added by the user.

  By selecting "Load" from the "Project" menu, a previously saved file
can be loaded.  This will load up all the masses and springs that were
saved, as well as the system parameters.   Any  previous state  before
the load is cleared.

  "Insert" is much like the "Load" menu, except that the current state
is not cleared.  Instead, only  the masses and springs are loaded (the
system  paramaters  are not changed),  and  are added  to  the current
collection.  If no objects  are selected when  "Insert"  is  selected,
then all the objects  in  the file are selected after they are loaded.

  Selecting "Save" saves this information in the last  file you loaded
from without any request. If you didn't load anything before, the file
requester will pop up.

  "Save as" acts like "Save" but always displays the file selector.

  By default, the  directory  which contains the ASpringies  files  is
present automatically,  it's the subdir called 'lib'  in the directory
where ASpringies resides.

  Cancelling the file requester leaves the system state untouched.  If
a file error occurs (for example, the file does not exist),  a warning
requester appears.