Started building out new infrastructure in the EE to track txm's read/write sets. This is needed in order to implement OCC. Added a new HStoreConf parameter 'site.exec_readwrite_tracking' so that we can enable this feature selectively in our experiments. #132
Added in hooks to enable read/write set tracking. This compiles but is untested at the moment. I need to meet with Stan about the anti-caching paper now... #132