In the conflict resolver, improve descriptions for incoming additions.
In the conflict resolver, improve descriptions for incoming additions.

* subversion/libsvn_client/conflicts.c
  (describe_incoming_add_upon_update,
   describe_incoming_add_upon_switch,
   describe_incoming_add_upon_merge,
   describe_incoming_reverse_deletion_upon_merge): Items which appear are
    always new, so label them as such. And use complete sentences.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1736343 13f79535-47bb-0310-9956-ffa450edef68

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