Fix issue #3807, "'svn up' of a nonexistent child in a copied dir triggers
an assertion".  This patch makes a couple of places look for the attributes
of added nodes, where previously if a node was added they had ignored it.

###: not sure about the adm_crawler.c changes

###: what *should* the 'svn up' do?  Should it always succeed silently, or should 
###  'svn cp A A2; svn mkdir ^/A/foo; svn up A2/foo' pull the new directory?

* subversion/libsvn_wc/update_editor.c
  (make_dir_baton):
    Scan more than the BASE tree when computing NEW_RELPATH.
  (make_editor):
    Look for REPOS_ROOT_URL and REPOS_UUID for added nodes, too.

* subversion/libsvn_wc/adm_crawler.c
  (svn_wc_crawl_revisions5):
    Consider svn_wc__db_status_absent the same as svn_wc__db_status_not_present.