JaxenCompiled clone does not reset the underlying Jaxen API's reference to the Jaxen VariableContext

[rolfl]

A clone of a JaxenCompile instance will use the original instance's Jaxen VariableContext when evaluating expressions.... in other words, changes to the 'cloned' variable context are not available to the Jaxen code that evaluates the expression, only the original context.

See thread http://jdom.markmail.org/thread/cljkhl27ll6jweyz