relax SVN archive

The bruker.read user function now throws a RelaxError when old PDC files are detected.

This is a partial fix for bug #20152 (https://gna.org/bugs/?20152).

Created the test_bug_20152_read_dc_file() GUI test for catching bug #20152 (https://gna.org/bugs/?20152).

This includes truncated data taken from the bug report (with data for only the first 3 residues).

Set up the Bruker Dynamics Center system tests as GUI tests.

This is in preparation for catching bug #20152 (https://gna.org/bugs/?20152).

Re-added Dominique Marion's solvent suppression to the NMRPipe script in the curve-fitting chapter.

A few small edits of the relaxation curve-fitting chapter.

This is to reinforce the exact time of the relaxation time period.

Added some text to explain why test only J(0) is discussed whereas the script also calculated F_R2 and F_eta.

This was suggested by Edward d'Auvergne in a post at:
https://mail.gna.org/public/relax-devel/2012-09/msg00044.html
(Message-id: <CAED9pY9U46ga6_j245peX1ETNZc_Lw0f5cz+5xx5rGVhee29YA@...>)

Big clean up of the Bibtex bibliography file for the relax user manual.

Small edits of the consistency testing figure caption in the relax user manual.

Editing and a number of fixes/cleanups for the consistency testing chapter of the user manual.

Editing of the "Values, gradients, and Hessians" chapter of the user manual to make it fit better.

The context of this chapter has been specified by changing the title to "Optimisation of relaxation
data -- values, gradients, and Hessians" and the intro text has been updated. As this chapter is no
longer straight after the model-free chapter, this is needed.