relax SVN archive

Added some code missing from the lib.dispersion.ns_2site_star module.

This code was accidentally not copied from http://thread.gmane.org/gmane.science.nmr.relax.devel/4132.

Polished the lib.dispersion.ns_2site_star module docstring.

Made the lib.dispersion.ns_2site_star module importable in the absence of Scipy.

Added Paul Schanda's code for the numerical solution to the Bloch-McConnell equations for 2-sites.

This is specifically code which uses complex conjugate matrices. The code was submitted at
http://thread.gmane.org/gmane.science.nmr.relax.devel/4132.

Small edit of the legend of the relaxation dispersion figure showing the Ishima & Torchia 2005 being wrong.

Added the relax wiki site (http://wiki.nmr-relax.com) to the menu of all pages of http://www.nmr-relax.com.

Loosened a parameter check in the Relax_disp.test_hansen_cpmg_data_IT99 system test to pass on certain Linux systems.

Release checklist minfx and bmrblib version update to the newest versions.

Fix of the two-point dispersion error formula in the docs.

This includes the relax_disp.select_model user function docstring and the relax manual.

Added a demonstration of why the Ishima and Torchia 2005 error formula is incorrect.

The script test_suite/shared_data/dispersion/error_testing/simulation.py has been added to simulate
the fixed relaxation time period error propagation. This produces the test_suite/shared_data/
dispersion/error_testing/error_plot.agr Grace graph. The formula, graph and a description has been
added to the relax manual explaining everything.