another try at fixing history states

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another try at fixing history states

Jim Barnett
I've taken another try at fixing the algorithm.  I have defined
getEffectiveTargetStates, which dereferences history states. However,
addDescendentStatesToEnter does not call it, since it dereferences
history states directly and records the executable content, etc.  I've
also changed computeEntrySet so it does _not_ place the target set of
transitions on statesToEnter.

Take a look and let me know if you think this is correct.

http://www.w3.org/Voice/2013/scxml-irp/SCXML.htm
http://www.w3.org/Voice/2013/scxml-irp/SCXML_Diff.htm
--
Jim Barnett
Genesys