stupid: Fail over to full revision when a PatchError is thrown (issue294) Also give an enhanced exception message when an AssertionError is thrown out of subvertpy. Can't test this as throwing an exception from the appropriate place leaves file handles open in the SVN repository, resulting in a failure to clean up in tearDown().

--- a/tests/run.py
+++ b/tests/run.py
@@ -20,6 +20,7 @@ def tests():
     import test_fetch_truncated
     import test_hooks
     import test_pull
+    import test_pull_fallback
     import test_push_command
     import test_push_renames
     import test_push_dirs