Query: Moved stats classes into main source tree.

This fixes the build process, because the command line client doesn't
include filter-src in the test classpath.

Also fixed the naming of the QueryDefinitionPreprocessor.
Query: reverted some recent changes.

There were some recent changes that hacked around missing information
in datasets from Epiphany. This information was missing because of
the way the datasets were being loaded. This has now been fixed; see
0322031a. Since it's fixed, we no longer need these hacks.
Query: Fixed Box*.intersect for non-intersecting boxes.
Added .SAMPLE suffix to rsaworker config to allow local changes.
Added config file to allow SpatialCubeService to join other Akka clusters.