relax SVN archive

The spectrum list GUI element can also now be enabled/disabled via Enable().

The relaxation data list GUI element can now be enabled/disabled via Enable().

All the model-free auto-analysis activation and deactivation calls now pass through wx.CallAfter.

This is to avoid racing.

The model-free model fields are now activated/deactivated with the execution lock.

Eliminated the add_spin_element() method and shifted to using the Spin_ctrl object.

Some fixes for the new Spin_ctrl analysis object.

Created the Spin_control object for the analysis GUI elements from the base add_spin_element() method.

This class implements the Enable(), GetValue(), and SetValue() methods to mimic a wx control.

Started to create the method for enabling/disabling the analysis tab in response to the exec lock.

More tooltip improvements in the relax controller.

Improvements to the relax controller tooltips.