Using ThreadUtil instead of Thread.
Merge branch 'master' of https://github.com/malin1993ml/h-store
Modify the sample rate of aLRU. Exclude the index memory in eviction threshold for now.
Restore the timestamp build flag. Some test code on the way.
All right. I forgot to turn on the anticache_build.
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What a bug!!! We do not need to scan the specific block when calculating tupleID in LRU.
Replace set to sort in EvictionIterator.
Add the sort to EvictionIterator.
Replace the tuple-based sampling to block-based in anti-cache timestamps.
Add one block to evict to ensure there's someting when evict_num is really low.
Clean up the allocatortracker test.
Little change to #sample-block.
Rollback the block-sample to tuple-sample. Cleanup of codes.
Merge branch 'master' of https://github.com/malin1993ml/h-store

Conflicts:
	src/ee/anticache/EvictionIterator.cpp
	src/frontend/edu/brown/hstore/AntiCacheManager.java
Implement another sampling method. Now we sample the same offset at every block at once.
Restore the anti-cache timestamps to tuple-based method.
Add new parameter ANTICACHE_TIMESTAMPS_PRIME.
Finish the part in EvictionIterator of prime-based sampling.
Turn off the new sample method for anti-cache timestamps.
Minor fix of prime strategy.