relax SVN archive

Loosened the checking conditions for the test_set_value() J(w) mapping system (and GUI) test.

Just like the consistenecy testing, the GUI string conversions to and from floats introduces a
slight truncation.

The consistency testing test_set_value() system (and GUI) test has been made less strict.

The conversion of the bond length and CSA values to GUI strings and back to floats causes a slight
numerical truncation.

Fix for one of the consistency testing system test scripts.

The J(w) mapping user function was being called instead!

Fix for the recently changed consistency testing test suite script.

Missing imports!

The specific analysis API base return_data_desc() now has a basic implementation.

This will search through the global and then spin parameters objects, returning what ever is found.

The specific analysis API base method calls to RelaxImplementError now send in the function name.

This allows for better identification of what needs to be implemented.

The specific analysis base API default_value() method is now functional.

Rather than raising a RelaxImplementError, this method now searches in the global parameters then
the spin parameters for a default value.

This should have been part of r16460!

This matches the J(w) mapping changes of r16458.