relax SVN archive

The relax_data.dipole_pair backend now uses the direct_bond flag.

Added CONECT records to the sphere.pdb file to allow connectivities to be more easily determined.

This is for the internal reader, as the current algorithm for finding attached atoms is distance
based, and as all N atoms of all residues are at [0, 0, 0], this algorithm fails.

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.