Explicit check for Body._index = 0 was removed, since scaling can still be applied without a SimTK system underneath. Check is now for "ground" by name.
Explicit check for Body._index = 0 was removed, since scaling can still be applied without a SimTK system underneath.
Check is now for "ground" by name.

git-svn-id: 9e047e1e624cce0a2485e750063112e834f85522@5638 fc29be9c-2cb0-420d-b520-73dbd18add6e

opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core