relax SVN archive

A timer is now being used to update the gauges of the relax controller.

The gauges were previously not pulsing correctly.

The Question message dialog answer is now set to 'No' if the window close icon is clicked.

The Missing_data and Question message dialogs are now always on top.

This prevents them from being hidden by other windows.

The gui_to_float() and gui_to_int() functions can now handle float or int inputs.

Add of the gui_to_*() functions now check for empty unicode strings u'' as well.

Modified the gui_to_float() and gui_to_int() fns to handle expressions.

This means that the float '1.23 * 1e-6' or '1.234 * 4 - 0.06' can input by the user.

Fix for the spectral list GUI element on Mac OS X.

The ListCtrl.DeleteColumn() method is faulty on Mac OS X. So instead all columns are deleted in one
go, and then the entire thing is created on update.

Fix for the spectrum.replicated user function page on Mac OS X.

GetValue() cannot be used on a ComboBox when nothing is selected on a Mac!

The font is now set on the text of the Question message box.

Added checks for sequence and spectral data for the Rx curve-fitting and NOE auto-analysis tabs.