Changes

This is the first release of the unstable 1.3 development line. In addition to all the capabilities of [[relax 1.2.10 ]] the new features of this release include the addition of a unit test framework, preliminary support for PyMOL, the [http://www.nmr-relax.com/manual/structure_write_pdb.html creation of PDB files], the ability to [http://www.nmr-relax.com/manual/pymol_tensor_pdb.html display the diffusion tensor encoded as a PDB file using PyMOL], the ability to display the [http://www.nmr-relax.com/manual/pymol_vector_dist.html distribution of XH bond vectors] used in the analysis via a PDB file, the new user function class 'structure' containing the old user function 'pdb()' which has been split and redesigned, removal of apply(func, args) calls from the minimisation code, improved spin system selection using Boolean operators, and a few other small features, bugfixes, and program changes. As the user function names have been and will continue to be modified please do not expect either the backwards or forwards compatibility of relax scripts written for the 1.3 relax versions.