Create a branch to explore CONNECTORS-989

git-svn-id: https://svn.apache.org/repos/asf/manifoldcf/branches/CONNECTORS-989@1607604 13f79535-47bb-0310-9956-ffa450edef68
Initial work on various APIs

git-svn-id: https://svn.apache.org/repos/asf/manifoldcf/branches/CONNECTORS-989@1607853 13f79535-47bb-0310-9956-ffa450edef68
Merge (modified) changes from CONNECTORS-989 branch.  Still doesn't build; needs work on IngestStatuses class

git-svn-id: https://svn.apache.org/repos/asf/manifoldcf/branches/CONNECTORS-989-2@1608414 13f79535-47bb-0310-9956-ffa450edef68