relax SVN archive

Added the infrastructure for a skip button in the wizard.

Set the skip icon to be arrow-right-double-relax-blue.

Created relax blue versions of the arrow-right-double oxygen icons.

Added the arrow-right-double oxygen icons.

Changed the order of the integration method and column in the GUI element.

Updates to the spectrum.read_intensities user function and an argument order change.

Update to the spin.element user function docstring.

The NOE spectrum type is now shown in the Spectrum_list grid element.

Fix for the number of rows in the Spectra_list GUI element.

More fixes for the spectrum GUI user function pages - the values are now correctly converted.

Many numbers and integers were converted to strings, whereas they should be floats or ints.