ACCUMULO-3123 Document custom per-table properties

Signed-off-by: Christopher Tubbs <ctubbsii@apache.org>
ACCUMULO-1798 Add ability to specify compaction strategy for user specificed compactions.
ACCUMULO-3385 Fix broken DateLexicoder ordering

  Corrects the ordering so that dates before 1970 actually sort before dates
  after it. This changes the internal serialization, so please see the release
  notes for a workaround if you have data written with the buggy form.
Merge branch '1.6'

Conflicts:
	core/src/test/java/org/apache/accumulo/core/client/lexicoder/ReverseLexicoderTest.java
ACCUMULO-1798 Remove unused import
ACCUMULO-3177 Create a per table volume chooser
ACCUMULO-3177 Improvements/Additions to PerTableVolumeChooser

  Make PerTableVolumeChooser default and require VolumeChooserEnvironment.
ACCUMULO-3178 Create example preferred volumes chooser
ACCUMULO-3178 Small refactoring suggestions