relax SVN archive

Missing RelaxError import.

The relax GUI state_load() method now checks if the data store is empty.

Previously a warning was only giving is analysis tabs are loaded. Now the warning occurs whenever
there is data in the relax data store.

Fixes for user function calls in the spin viewer and the pipe editor.

Missing import.

Removed unused imports.

Eliminated all of the wizard GUI input methods.

These are now all covered by the gui.input_elements package, so are no longer needed. The analysis
wizard had to be converted to using the package, but the methods are now no longer used.

Converted the spin_id_element() wizard method into the gui.input_elements.spin_id.Spin_id GUI element.

Changed the minimise max_iter arg so that it has a min of 1 and max of 1e9 and is a GUI SpinCtrl.

This is a replacement for r16479, in that the arg element is reverted to a SpinCtrl but with a very
large upper limit.

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.