#1 Export is broken when the scene has been simulated

[Markus Storm]

Repro:
Create a scene, add all objects, simulate ("continous") and then export to an XML file. The maxTimestep, maxIterations, and timeStepMethod fields of the NxSceneDesc will be different than when doing the export directly (without simulating).

Workaround:
1. Don't simulate before exporting
or
2. If you have simulated, remove all objects, then add them again, and then export