relax SVN archive

Removed some unused imports.

Removal of empty lines.

Shifted the title and subtitle creation for the NOE frame into a base class for all frames to use.

The formatting has also been regularised to improve the look of the GUI across operating systems.

Regularisation of the font formatting in the steady-state NOE GUI tab.

Shifted the model-free tab font formatting to be interface wide in self.gui.

This will help regularise the font throughout the GUI.

Normalisation of the text in the auto model-free analysis GUI tab.

The font sizes are now all the same, the text is not right aligned (not seen under Linux but very
ugly in Windows), and semicolon usage and capitalisation is normalised.

Better behaviour of the deletion of single cells in the Rx peak list grids.

The relaxation time is now cleared, rather than set to 0.0.

Navigation keys are now allowed in the Rx tab delay time text field.

The delay time textctrl can now only have a single '.' char in the peak list grid.

Fix for the Delay_num_cell_editor.Clone() method for cloning the grid editor class.