First implementation of the lattice data for SimPhoNy CUDS
Lattice data class implementation
Lattice data class implementation
Modified to PEP8-style
Modifications according to the pull request issues
Modified unit tests: now using only public attributes/methods
Removed nonstandard comments; now using read-only attributes in Lattice; changed the clone_data of LatticeNode
Removed clone_data method from LatticeNode; Lattice now stores references directly to DataContainers instead of LatticeNodes.
Merge pull request #21 from simphony/feature-lattice2

Feature lattice2