Here is a patch that allows assignment from one property in the tree to another 
property.  Also put a check in there so that FG no longer segfaults if the
value to be assigned is not defined in the XML.

Usage Example:
  <command>property-assign</command>
  <property>/sim/destination-property-value</property>
  <property>/sim/source-property-value</property>

http://www.spiderbark.com/fgfs/property-assign-patch.gz

Best,

Jim

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