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Merge branch 'master' of https://github.com/jinfei21/timesquencedb

Conflicts:
	src/main/java/com/ctriposs/tsdb/DBEngine.java
	src/main/java/com/ctriposs/tsdb/level/StoreLevel.java
	src/main/java/com/ctriposs/tsdb/manage/FileManager.java
	src/main/java/com/ctriposs/tsdb/table/MemTable.java