Revision 2116

Several improvements:

 . Moved path detection and adding into a module of its own,
   adjustpath, which exports thubandir as main Thuban directory.

 . Reorganised the module in order to support the SkipTest feature for
   Thuban test cases.

   - Adjusted the error handling for importing the ogclib from the
     PyOGCLib package.

   - The test class is no longer a specialisation of WMSClient, but
     contains an instance of this particular class and uses its
     methods instead.

   - The special setUp() method will check whether importing PyOGCLib
     worked by calling the external function skip_if_no_ogclib() and
     also create the WMSClient instance.

   - Call support.run_tests() instead of unittest.main().