LUCENE-5863: add 4.3

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1624081 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5863: add 4.2.1

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1624083 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5863: add 4.0-BETA and rename 4.0 to alpha

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1624088 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5863: add 4.0 indexes (actually from 4.0 release)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1624090 13f79535-47bb-0310-9956-ffa450edef68