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Use Apache Commons EL instead of the Flexible String Expander
For syntax reference see:
http://java.sun.com/products/jsp/syntax/2.0/syntaxref207.html
Based on early research of the syntax it looks like most of our current Flexible String Expander usage would work with EL. The "${}", "." and "[]" syntax elements all appear to be supported.
We would also get new features like arithmetic expressions and so on.
Change the Entity Engine to be user aware for security, logging
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