Add features into our build process that can make use of the SVNKit library to
interact with the Subversion workspace.  This includes three components:

- A new Ant task that stores the current workspace revision number in an Ant
  property which gets built into DynamicConstants.java and exposed in the
  --fullversion and "cn=version,cn=monitor" information.

- A new Ant task that checks all files that have been locally modified in the
  current workspace for potential cases in which a copyright date needs to be
  updated to include the current year.

- A change to the coveragediff tool so that it uses the SVNKit library to
  obtain the diff rather than trying to execute the external svn/svn.exe
  command.