Merge pull request #108 from mnjuhn/master

Adding shared factory methods to Model Objects factory.
Merge pull request #109 from mnjuhn/master

Adding optional modstamp scenario record.
Make Node.equals() respect possible point==null
Redundant null checks

Base class already handles this
Simplify list re-setter using existing getter

Also fix a compiler warning
More simplification, remove unnecessary cast
Remove unnecessary null checks
Merge pull request #110 from andrewbts/allow-null-point-of-node

Make Node.equals() respect possible point==null
Merge pull request #111 from andrewbts/null-and-list-handling

Null and list handling