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TRACE_READ - log a message whenever the property is read. TRACE_WRITE - log a message whenever the property is written. The second one works only when the property value is changed through the property manager; tied variables and accessors are not polled for value changes because of the performance hit. These methods end up invoking private methods SGPropertyNode::trace_read and SGPropertyNode::trace_write. By setting breakpoints on these methods inside a debugger, it is possible to debug property access and find what parts of a program are reading or writing specific property values by doing a backtrace. In the XML property files, users can use the attributes 'trace-read' and 'trace-write' to control tracing; the value should be 'y' to enable tracing or 'n' to disable it (the default).
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