THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
- support cache chaining
- fix/test HIT_EVACUATE
- efficient support for byte range requests (partially complete)
- efficient support for large/small objects (improved for large objects)
- read-after-write improvements
- ram cache only operation
- add a meta data log as part of syncing a slide of the directory to reduce the frequency of directory syncs and speed of recovery