More work on issue #1004: Make 'svn add' cancellable.
More work on issue #1004: Make 'svn add' cancellable.

* subversion/libsvn_client/add.c
  (add_dir_recursive): Check for cancellation.

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