relax SVN archive

Fixed the 'sconstruct' file to handle Windows Vista.

Updated the __init__ file of the base directory of the unit tests.

Added the base class for the tests of both the 'prompt.value' and 'generic_fns.value' modules.

Updated the value.set() user function to the new relax design.

Wrote a unit test for testing the failure of copying alignment tensor data.

Updates to of the alignment tensor unit tests to make them all now work.

Improved the error message for the tensor from and to args.

Updated the generic_fns.align_tensor.copy() function to use the 'tensor' key.

Updated the unit tests of generic_fns.align_tensor.copy() to use the tensor_from and tensor_to args.

A number of alignment tensor unit test fixes.