Log Message:
Update to 2.39:

2.39: 2013-05-23
     New 'tagify' commsnd for tagifying empty commits.
     Correctness fixes for deletion edge cases.

2.38: 2013-05-10
     Significant improvements to Subversion branch link detection.
     New 'reparent' command for modifying the DAG.
     Fixes for two minor crash bugs in handling of malformed commands.