relax SVN archive

Fix for the Mf.test_write_results() system test for the Python 3 versions.

The logic for determining Python 3 versions was broken and the incorrect files was used for Python
3.1.

Python 2.4 and earlier fix for the GUI.

Try-except-finally statement blocks are not supported, so these have to nested in two try statements.

Python 2.4 fix - the unit test runner no longer uses the builtin set() method.

Better Python 2.3 support.

The compat module is now imported at the very start to allow the builtins to be set before any other
imports. The sorted() builtin method is now mimicked and the os.devnull string set for Python 2.3
and earlier.

Fix for the Mf.test_write_results() system test for Python 3.1.

The XML version in Python 3.1 is the old style! Therefore the old results file is being used to
check this Python 3.1 result.

Small improvements to the multiple python version test suite testing script.

Reactivated support for Python 2.3.

This mainly skips the missing 'subprocess' module. This however decreases relax's functionality a
little.

Fix for the test_write_protein_sequence() unit test for a recently introduced bug.

Python 2.4 and lower fix for the pipe_loop() generator method.

In these Python versions, a 'try' block with a 'finally' statement cannot contain 'yield'
statements! This work around should be compatible with all Python versions.

Python 2.4 fixes - the ctypes module does not exist in Python versions 2.4 and lower.

This is only used for some non-essential functionality on MS Windows, so now it is deactivated if
not present.