More softbody goodness;

More softbody goodness;

- Added Softbody effect for Lattices (not too useful yet without
  vertexgroups though)
- Added default vertex "goal" value + button, to be assigned when no
  vertexgroup exists (or vertex isn't in the group)
- Made softmin and softmax work as documented (defining min and max range)
- made changes in buttons send 'update' signal to softbody

And:

- added Nkey Properties to show lattice coordinates