relax SVN archive

Added a catch for no data in the error analysis by replicated spectra.

Fix for the relaxation curve fitting analysis in the GUI.

The heteronucleus name needs a '@' character at the start to be a spin ID.

The sequence file data is not needed if a PDB is specified.

The checks no longer fail.

Missing RelaxError import.

Fixed the setup of the Relax_fit auto_analysis class.

The relax prompt GUI element now has focus.

One import was accidentally deleted.

Many unused imports have been cleaned up.

Fixes for the color_code_noe() PyMOL macro creating function.

This now is more failure tolerant.

Shifted the NOE specific analysis code into its own package.

This is in preparation for splitting up the module and adding new modules.