Added reference data relevant for fields up to 50x50
Initial version of bestKnown packing.  Does not try to place optimally for trees or fill in remaining space in a rectangular field
In best known packing, fill in the remaining space in the rectangle using
a physical packing.  Added best known packing to list of potential
solutions to try.
Added method to compare Locations as equal
Fix physical packing to prevent it from giving up too easily, e.g., if it places a seed between trees without enough room, but there is still space elsewhere on the field
Merge branch 'best-known-packing' into physical-packing-fix

* best-known-packing:
  In best known packing, fill in the remaining space in the rectangle using a physical packing.  Added best known packing to list of potential solutions to try.
  Initial version of bestKnown packing.  Does not try to place optimally for trees or fill in remaining space in a rectangular field
  Added reference data relevant for fields up to 50x50

Conflicts:
	src/watermelon/group1/PackAlgos.java
Merge pull request #14 from adamreis/physical-packing-fix

Physical packing fix