[UIMA-3774] remove non-used "get" method (getReserve used in its place), update test cases, add check in put in case same thing added twice - ignore 2nd

git-svn-id: https://svn.apache.org/repos/asf/uima/uimaj/trunk@1590095 13f79535-47bb-0310-9956-ffa450edef68