relax SVN archive

Fix for the Sequence GUI input element SetValue() method - the wrong conversion function was being used.

Fix for the minimise user function in the GUI - the max_iter arg could only go up to 1000!

This arg was being set as a SpinCtrl with an upper limit of 1000! By allowing the arg to be None,
this is now a simple TextCtrl, fixing the problem.

The gui.string_conv.list_to_gui() function can now handle numpy arrays.

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.