relax SVN archive

Implemented the are_bonded() structural API method for the internal structural object.

Created the structural API base are_bonded() method - this is for determining if 2 atoms are bonded.

This is a method stub which raises a RelaxImplementError.

Started to add the backend of the relax_data.dipole_pair user function.

A few changes to the relax_data.dipole_pair user function definition.

Shifted the dipole-dipole graphics to the Wizard directory, as this is a wizard graphic.

Created graphics for the magnetic dipole-dipole interaction.

Removed the bond length from the model-free parameter list.

The bond length setting via value.set has no been merged into relax_data.dipole_pair.

This averaged length is dipole-dipole distance and does not need to be a model-free parameter.

Added the definition for the new relax_data.dipole_pair user function.

Redesigned the model-free dauvergne_protocol.py system test script for the interatomic concept.

The new script will be used to redesign how to set up a model-free analysis using the interatomic
data concept. It adds the new relax_data.dipole_pair user function which will be used to define the
dipolar relaxation interaction (this will inadvertently allow multi-dipole relation). The
heteronuc_type and proton_type parameters have been replaced with the spin_type parameter, as now
both the heternuclear and homonuclear spins need to be loaded into relax.