ACCUMULO-1470 updated documentation for logger.dir.walog

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ACCUMULO-1474 - making splits use a concurrent set instead of a standard set



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ACCUMULO-1469 Patch from Aaron Glahe. Set the tserver.memory.maps.native.enabled = false for the standalone conf DIRs.  This will explictly tell the system to use the non-native memory map. 

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ACCUMULO-1465 fixed formatting and titles for examples

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