relax SVN archive

Added a saved state containing Sparky peak heights.

This is will be used by the loading of peak heights system test. A script was also added to allow
the saved state to be regenerated when necessary.

Fixes for the system test of storing the S2 difference in a new data pipe.

The value.set() calls are now in the form of the new design.

Updated the epydoc fields in the docstring to include all error conditions.

Many updates and improvements to the spin selection and deselection functions.

Added the boolean arg to the desel_spin() function.

Another fix for the sel_read() function.

Changed all selection flags to bools.

Fixes for the sel_read() function.

Fixed the sel_spin() function.

Fix for the select.spin() user function.