Tartarus CVS: gravity2 richard

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CVSROOT:	/home/cvs
Module name:	gravity2
Changes by:	richard	00/01/04 18:55:49

Modified files:
	src            : Makefile.am game.cc item.h item_projectile.h 
	                 physics.cc universe.cc universe.h 

Log message:
Implemented conservation of energy.
Problems if projectile jumps into a location which it is physically
impossible for it to have reached (negative kinetic energy areas).
What to do? (Should subdivide at first, but if intervals get small
enough, should do some approximation.)