relax SVN archive

Fixed the diffusion tensor geometry function.

For the ellipsoid, delta_alpha, delta_beta, and delta_gamma were changed to dx, dy, and dz.
For the spheroid, delta was changed to dz.
psi was changed to O.

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.