REVISED - lines marked with ** have been fixed.

The project is to write a program similar to the bin packing
program we did in class.  (See our lecture notes web page for the 
code for that program.)  The difference between that program and
this project is that objects have an additional property, their volume,
and their is a maximum volume allowed for the objects in the subset.

** An object will be represented by obj(Weight, Volume, Value) and
** xobj(Weight, Volume, Value, Included)

An example problem is

**  objects([obj(3,5,5),obj(2,2,6), obj(4,6,1), obj(1,3,3)]).
maxWt(5).
maxVolume(8).
minVal(11).

A solution is

**  [xobj(3,5,5),xobj(2,2,6,t), xobj(4,6,1,f), xobj(1,3,3,f)]