relax SVN archive

Changed links for the API documentation from http://nmr-relax.com to http://www.nmr-relax.com.

Converted a link for the relax logo in the header of all website pages to http://www.nmr-relax.com.

The original link was http://nmr-relax.com/relax_logo.png but is now
http://www.nmr-relax.com/relax_logo.png.

Added support for handling missing data in the relaxation dispersion analysis.

This support was mentioned in the post http://thread.gmane.org/gmane.science.nmr.relax.devel/3835.

Shifted the R2eff/R1rho value and error assembly into specific_analyses.relax_disp.disp_data.

This is in the new return_r2eff_arrays() function. The code has also been debugged and made
functional.

Fixes for the func_LM63() dispersion target function.

Fix for the lib.dispersion.lm63 module and parameters of zero are now gracefully handled.

The reference spectrum is now not included when counting the number of dispersion points.

Shifted the LM63 dispersion model functions into the new lib.dispersion.lm63 module.

Fixes for the dasha.extract user function for the changes to the pipe_control.value.set function.

The values and errors are now set separately.

Redesigned the optimisation code of the dispersion analysis specific class for the new target functions.

This includes the assembling of R2eff/R1rho values instead of peak heights, and a number of small
fixes.