Release notes for ABCL 0.15
  - Fixed special bindings un-binding in compiled code for (local)
    transfer of control using GO/RETURN-FROM
- Special bindings now will get unbound in many more cases and much
    more efficiently upon local transfer of control.
  
- Reduced ANSI failures in both compiled and interpreted modes
- MULTIPLE-VALUE-SETQ wasn't working correctly on symbol macros.
    Multiple issues with DEFINE-SETF-EXPANDER, and others. See CHANGES.
  
- Multiple JSR-233 (Java scripting) support fixes
- See the logs for more: too much to summarize.
  
- Compiler new feature
- Support for COMPILE-ing functions with non-empty lexical environments -
    which themselves are not being compiled.
  
- Google App Engine
- Don't break when being run on Google App Engine because 'os.arch'
    isn't set.
  
- COMPILER-LET and MACROEXPAND-ALL
- CLtL2 primitive COMPILER-LET is now supported in the EXT package,
    so is MACROEXPAND-ALL.