relax SVN archive

Added 2 missing RelaxError imports.

Wrote 2 unit tests for the scale and angle_units args to the align_tensor.init() user function.

Added the scale and angle_units args to the align_tensor.init() user function.

Placed the align_tensor user functions into the interpreter namespace.

Implemented the framework for the unit tests of the generic_fns.align_tensor module.

Implemented 10 unit tests for fns of the generic_fns.align_tensor and prompt.align_tensor modules.

Initial copy (and a few changes) of the generic_fns.align_tensor module.

Added the import of the non-existent generic_fns.align_tensor module.

Implemented the align_tensor.copy(), align_tensor.delete(), align_tensor.display() user functions.

The back end doesn't yet exist.

Added the missing RelaxNoneStrError import.