Update from version 0.72 to 0.74.  Changes:

[Changes for 0.74 - June 1, 2008]

* Fix tests for svn 1.5.0.

[Changes for 0.73 - Mar 19, 2007]

* In get_latest_rev, resolve the right HEAD for use in get_logs.
  [Rolf Sch?uble]

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