relax SVN archive

The execution lock is now released if an error is thrown in the thread.

Shifted the GUI test check_exceptions() method into a base class for all tests to use.

The GUI tests are now checking if exceptions have occurred in the threads.

Stdio redirection is now no longer occurring when in testing mode.

Errors are now caught in the thread and placed in the status.analyses.exception_queue Queue object.

The Analysis_controller class is now creating a container 'analyses' for the status object.

This will be for storing all the GUI analysis specific status info.

The Execute.run_analysis() base class method has been created.

This raises a RelaxImplementError if called!

The run() thread (and pseudo-thread) method has been shifted to the Execute class.

The derived classes must now provide the run_analysis() method.

A dummy join() method has been created to make the non-threaded execution behave like a thread.

Simplification of the threading setup in the Rx analyses.