relax SVN archive

The structure.rotate R arg now defaults to the identity matrix.

This is simply for the GUI.

The frame order system tests are now being run as GUI tests as well.

Converted all of the frame order system test scripts to be executable as GUI tests.

Fixes for the script_exec() GUI test base method.

This now adds 'pi' to the namespace in which the scripts are executed in.

GUI test scripts are now executed via prompt.interpreter.exec_script().

This allows the preservation of imports within the scripts. The old execfile() method was causing
the 'globals' to be overwritten, hence imports in the scripts are not visible inside methods or
classes.

The GUI auto-generated user function SetValue() method now skips function and fn arg arguments.

These are not supported in the GUI!

Fixes for the grace.write user function definitions for the GUI.

The x_data_type and y_data_type can be set by the user to, for example, 'spin'. Therefore they
cannot be readonly.

Fix for the model-free GUI auto-analysis test under certain conditions.

The spin viewer window was loading the spins asynchronously, but the subsequent relaxation data
loading was synchronous. If a previous GUI test failed this would often trigger a racing condition!

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.