While making changes to how execution objects work, we had agreed to
name the base object ExecutionObjectBase instead of its original name of
ExecutionObjectFactoryBase. Somehow that change did not make it through.
Rather than require all ExecutionObjectFactoryBase classes to declare a
templated ExecObjectType type, get the type of the execution object
directly from the result of the PrepareForExecution method.
before it was wall prepareforexecution(device) creating an execution object but invoke calls this function now through the transport tag so we just need to give it the factory object not the execution object
In order to make the change from the current way execution obejcts are utilized to the new proposed executionObjectFactory process type checks now has to look for the new execution object factory class to check against.
1. Fix incorrect computation of grid dimensions.
2. Add checks for empty bounding box of bins.
3. Workaround issues caused by floating point precision.
