relax SVN archive

Ported r2886 from the 1.3 line.

The command used was:
svn merge -r2885:2886 svn+ssh://bugman@.../svn/relax/1.3

This removes the PDF manual from the repository.

Removed the PDF user manual from the repository.

As the file is a large (2.6 Mb) binary file and changes often, it has been removed from the
repository. This should stop the relax Subversion repository getting too bign. The manual can
easily be compiled from the sources using Scons.

Ported r2884 from the 1.3 line to fix bug #7845 (https://gna.org/bugs/?7845).

The command used was:
svn merge -r2883:2884 svn+ssh://bugman@.../svn/relax/1.3

This bug was reported by Sebastien Morin (https://gna.org/users/semor) and the fix was to increase
the precision of the chi-squared value in the model-free results file.

Fix for bug #7845 (https://gna.org/bugs/?7845).

This bug was reported by Sébastien Morin (https://gna.org/users/semor).

The fix was to increase the precision of the chi-squared value in the model-free results file.

Ported r2881 and r2882 from the 1.3 line.

The command used was:
svn merge -r2880:2882 svn+ssh://bugman@.../svn/relax/1.3

This fixes two misspellings of the 'params_converged' flag and reformats the print out messages of
the convergence tests.

Improvements to the printed out convergence test messages.

Fixed two misspellings of the 'params_converged' flag.

Ported r2878 and r2879 from the 1.3 line.

The command used was:
svn merge -r2877:2879 svn+ssh://bugman@.../svn/relax/1.3

This fixes two bugs in the 'full_analysis.py' script.

Fixed a bug in the convergence tests where a float was being printed as a string.

Bug fix for the failure of model selection in the 'full_analysis.py' script.

Because the 'run.delete()' user function had been removed the 'previous' run, which is a global
model, was being included in the list of runs (m0, m1, m2, etc.) for model selection cause a
failure.