ACCUMULO-1005 Applying patch contributed by Tim Reardon to remove Charset options from Authorizations and ColumnVisibility, with minor edits from John Vines and minor documentation additions and cleanup from myself

git-svn-id: https://svn.apache.org/repos/asf/accumulo/branches/1.5@1479039 13f79535-47bb-0310-9956-ffa450edef68