Change the 'svn status' letter for tree conflicts from 'T' to 'C', following

Change the 'svn status' letter for tree conflicts from 'T' to 'C', following
discussion on the mailing list. A follow-up to r33288 which introduced it.

* subversion/svn/status.c
  (print_status): Print 'C' in the tree status column, not 'T'.

* subversion/tests/cmdline/stat_tests.py
  (status_with_tree_conflicts): Expect tree-conflict status 'C', not 'T'.

* subversion/tests/cmdline/svntest/tree.py
  (build_tree_from_status): Expect tree-conflict status 'C', not 'T'.

* subversion/tests/cmdline/svntest/wc.py
  (StateItem): Adjust the 'treeconflict' attribute doc-string accordingly.

git-svn-id: http://svn.apache.org/repos/asf/subversion/trunk/subversion/tests/cmdline@873384 13f79535-47bb-0310-9956-ffa450edef68