transferring old ROP docs

(cherry picked from commit 5d383c42f415554dda9f2f1c0a7ac1fcaaffa5fd)

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/branches/STABLE-3.1@1555564 13f79535-47bb-0310-9956-ffa450edef68
Using only major version in docs metadata

otherwise Google is confused how to find docs for a given v. of Cayenne
(oops..)

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/branches/STABLE-3.1@1555565 13f79535-47bb-0310-9956-ffa450edef68