- Fixed arithmetic over address types

- Now allow complex arithmetic in expression initialization
- Added support for logical OR operation in arithmetic
- added commands INTER and UNION for set-based analysis
- fixed bug in PRE/POST command that was forgetting to initialize a hash
- Added support for lazy reflection when given a second parameter to command (avoid reflecting a whole block, you can ask a number of instr now)
- Added API for list append
- Added testsuite for rewriting (rewrite-simple.esh)
- other minor cleanups