relax SVN archive

Fixed another copyright notice date.

Hopefully the last of the diffusion tensor name changes (to sphere, spheroid, and ellipsoid).

Updated the grid search for the Da and Dr diffusion parameters.

Fixed the dates in the copyright notices.

A few more diffusion tensor name changes.

Finished changing the naming of the diffusion tensor.

This time all references to isotropic, axially symmetric, and anisotropic diffusion have been
changed to sphere, spheroid, and ellipsoid respectively.

Bug fix:

Added a missing bracket.

Updated the weights to use the new diffusion tensor parameter sets.

Changed a few more isotropic diffusion references to sphere.

Updated the correlation times and changed the naming of the diffusion tensor.

The correlation time values, gradients, and Hessians of the rotational Brownian diffusion have been
modified using the equations

Diso = 1/3 (Dx + Dy + Dz),
Da = Dz - 1/2(Dx + Dy),
Dr = Dy - Dx / 2Da.

All references to isotropic, axially symmetric, and anisotropic diffusion have been changed to
sphere, spheroid, and ellipsoid respectively.