Added pypjua.applications.util module

darcs-hash:20090211153649-1e3d8-907c9efdfd2b52ccec92434d8f3b4ab5c4e99f16
Updated unit test for pidf

darcs-hash:20090211153659-1e3d8-c8ee9be87d802a6f5d06540bffba787f048dc1aa