ACCUMULO-2494 add commons-math to 1.5
Merge branch '1.5.2-SNAPSHOT' into 1.6.0-SNAPSHOT
ACCUMULO-2169 tighten up rat check in build script
Merge branch '1.4.5-SNAPSHOT' into 1.5.2-SNAPSHOT
ACCUMULO-2547 run the tservers with more memory
Merge branch '1.6.0-SNAPSHOT'
ACCUMULO-2503 add formatter tests
Merge branch '1.6.0-SNAPSHOT'
ACCUMULO-1218 Overview on how to recover an instance from failed zookeepers

Ample warning given to the reintroduction of stale data (from files
that should be deleted but have not yet been deleted) or omission
of new data only present in WALs.
Merge branch '1.6.0-SNAPSHOT'
ACCUMULO-2503 fix time zone assertion
Merge branch '1.6.0-SNAPSHOT'
ACCUMULO-2539 Expand javadoc for Combiner to be more specific about combination implementation

Explicitly note that, most times, fetchColumnFamily or fetchColumns is desired and that columns
are only combined within a row. Only multiple versions for otherwise equal Keys are combined.
Merge branch '1.4.5-SNAPSHOT' into 1.5.2-SNAPSHOT

Conflicts:
	core/src/main/java/org/apache/accumulo/core/iterators/Combiner.java
Merge branch '1.5.2-SNAPSHOT' into 1.6.0-SNAPSHOT
Merge branch '1.6.0-SNAPSHOT'
ACCUMULO-2503 Fix timezone-related failures in ShellTest
Merge branch '1.6.0-SNAPSHOT'
ACCUMULO-2532 Relax access on cleanupIndexOp and add tests that show failure case.
ACCUMULO-2532 Use VolumeManager to check for tmpDir existence.