Fix issue #1069:  "'svn merge' opens the DB files too many times".
Fix issue #1069:  "'svn merge' opens the DB files too many times".

* libsvn_client/diff.c (merge_file_added): use the subpool to call
  svn_client_copy, not the quasi-global pool.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion