Add reversion code for restoring carrydown and hopcount links to their original condition.  This code may not wind up being used, but the refactoring involved in creating it will be helpful regardless.

git-svn-id: https://svn.apache.org/repos/asf/manifoldcf/branches/CONNECTORS-990@1610676 13f79535-47bb-0310-9956-ffa450edef68
Only finish documents that we know are complete

git-svn-id: https://svn.apache.org/repos/asf/manifoldcf/branches/CONNECTORS-990@1610680 13f79535-47bb-0310-9956-ffa450edef68