relax SVN archive

Increased the content of icons in the auto-generated user function menus.

Improved the relax noe icons by modifying the wizard SVG file.

Converted the noe user functions to the auto-generation design.

The noe wizard graphic has been converted into icons for the menus.

Created the generic_fns.spectrum.get_ids() function for returning all current spectrum IDs.

This will be used by the noe.read_intensities user function.

Increased the icon content in the auto-generated user function menu.

Added the archive-extract Oxygen icon.

Added the document-edit Oxygen icons.

Added all sizes of the dialog-ok and dialog-ok-apply Oxygen icons.

The user function args can now have minimum and maximum values for integers specified.

This was accidentally partly committed in the last commit! The min and max args can now be given,
and these are then propagated all the way to the GUI elements. For the Sequence and Sequence_2D
elements this has no effect yet as they do not implement wx.SpinCtrl elements.

Eliminated the 'prune' argument to the monte_carlo.error_analysis user function.

This will never be used again, and might tempt some users into changing the value and damaging their
analysis!