Detect delete tree-conflicts during move-update.

* subversion/libsvn_wc/wc_db_update_move.c
  (check_tree_conflict): Add action parameter.
  (tc_editor_add_directory, tc_editor_add_file, tc_editor_alter_directory,
   tc_editor_alter_file): Adjust callers.
  (tc_editor_delete): Check for conflicts.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1434637 13f79535-47bb-0310-9956-ffa450edef68
* subversion/tests/cmdline/externals_tests.py
  (pinned_externals): Fix issue number.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1434638 13f79535-47bb-0310-9956-ffa450edef68