relax SVN archive

Python 3 preparations - the use of the queue module in the status module is now compatible with 2 and 3.

Python 3 preparations - the GUI tests are now fully Python 2 and 3 compatible.

The command used was:
2to3 -w -f except -f import -f imports -f long -f numliterals -f xrange .

Python 3 preparations - the queue modules for both Python versions are now supported in the GUI tests.

Python 3 preparations - the test_suite.gui_tests package now uses absolute module path imports.

Removed some temporary debugging code.

Bug fix for the BMRB system test initialisation for when the bmrblib module is missing.

The base __init__() method needs to be initialised first.

Python 3 preparations - the unit tests are now fully Python 2 and 3 compatible.

The command used was:
2to3 -w -f except -f import -f imports -f long -f numliterals -f xrange .

Python 3 preparation - all of the _generic_fns unit tests now use absolute module imports.

Python 3 preparations - all the _prompt unit tests now use absolute module imports.

Python 3 preparation - removed all xrange() calls from the unit tests, these are not needed.