First step in supporting iterative change lists queries in FSX. 
First step in supporting iterative change lists queries in FSX. 

* subversion/libsvn_fs_x/cached_data.c
  (svn_fs_x__get_changes): Assuming some data has already been delivered,
                           only return the remainder.  Future commits will
                           restrict the "fetch the remainder" case to fewer
                           and fewer cases.

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1733814 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion