LUCENE-5703: BinaryDocValues producers don't allocate or copy bytes on each access anymore

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1600741 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5721: Monotonic compression doesn't use zig-zag encoding anymore.


git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1600747 13f79535-47bb-0310-9956-ffa450edef68