- Fixed loading of tests by name when name refers to unbound

- Fixed loading of tests by name when name refers to unbound
  method (PyUnit issue 563882, thanks to Alexandre Fayolle)
- Ignore non-callable attributes of classes when searching for test
  method names (PyUnit issue 769338, thanks to Seth Falcon)
- New assertTrue and assertFalse aliases for comfort of JUnit users
- Automatically discover 'runTest()' test methods (PyUnit issue 469444,
  thanks to Roeland Rengelink)
- Dropped Python 1.5.2 compatibility, merged appropriate shortcuts from
  Python CVS; should work with Python >= 2.1.
- Removed all references to string module by using string methods instead